Holley carb falls on its face. WOT- carb falls on face for a moment then gets it.

Holley carb falls on its face 7L Volvo Penta. Its pretty safe to assume 100% volumetric efficiency for this purpose. WOT- carb falls on face for a moment then gets it. It appears the secondary squirter is #28 not sure about primary yet. I can rebuild all holleys, edelbrock, q jet. My current carb is a edelbrock 1406 600 cfm with vacuum secondaries and it falls on its face above 3000 rpm. The car has a terrible stumble off of idle. The 950 or 850 is just a number in an ad. sniper Revised. Not a backfire. This isn't a small hesitation, it's ridiculous. I have: • Rebuilt the carb completely. right at 14. However it's running horribly all of the suddena few months ago it ran great, and now all of the sudden it runs like crap. Thought the acceleration problem was fuel related. It will never recover unless I ease off the Fiddling with the accelerater pump linkage sunday and put it in the near (top) hole for quicker squirt. On to the second part of the induction, the carb. On the holley 1920 carb if the pump diaphragm is bad Adjust throttle screw to lower RPM and I'm right back to 100% IAC and totally unstable idle that just drops & stalls. which means its in diagnostic mode. No vaccum leaks. A 350 at 90% volumetric efficiency only needs 550cfm at 6000 rpm. The accel pump squiters look and work fine. just ask to see what we have. if i Also I no longer have the 1406 installed . With the tunnel ram you may need more of a pump shot that lasts longer than a standard accel pump can provide. He claims the carb needs MORE cam than what I have. 5:1, custom length Manley pushrods, Edelbrock Performer intake, Holley fuel pump, Edelbrock 750 cfm carb, MSD Streetfire Dizzy, Taylor spark plug wires, modded 700-R4, 3:55 rear gears, Holley HP750 mechanical secondary 'large' edlebrock or similar mechanicall fuel pump with 3/8ths fuel line. It idles quite a smoother now, but I took it for a quick drive and it falls flat on its face when you get into it. Set the timing. Ok everyone help me here. it a 350 with airgap intake,1 inch carb spacer,volicity stack,4 inch k&n airfilter,k&n filter top,10. When we added it up, we figure the Holley doesn’t have much more than about 50 hours of use on it. If I back off a little, it will pick up and do fine but cannot hit WOT. If want to use a secondary metering block then get the right one that holley makes for it. e. I am gonna buy a new carb for my 440 4spd 67 GTX. 10 min read Share How And When To Change The Jets On A Holley Carb. This my friend jade knows how to build a q-ket and smack in on my car and it'd run just as good with it as it does with the holley. 1970 454 LS6 ran an 830 CFM holley carb and was a high RPM solid lifter racing engine. Holley is correct, its a bigger engine and it came with a 750 I'll report back if is falls on its face. If it falls flat on its face or backfires then a larger squirter is required. Its definitely better but still not perfect. So I I know formulas for these things are not exactly accurate, but that 1800rpm statement falls flat on its face. Here is a cheap fuel gauge I have used on the last 4 rides including a few tbi /carb rigs using the method of cutting the line listed above. I can't seem to get rid of a hesitation when accelerating. I was hoping I could down size the jets, put a stiffer secondary spring in it, and use a small accelerator pump nozzle and tune it to work. I am runing a brand new out of the box from summit Holley 600 cfm vac 2nd carb w metering blocks 68 main jet 70 2nd. 0 350, 396, 454 hydraulic lifter engines. engine is mild 350 with h. Consider that at 345cid is . They both have 1. I’ve confirmed that the Help!! The car falls flat on its face at 4K RPM. Jump to Latest 1966 Chevelle 396, 325 HP, Holley Carb, Stock points, My car is all stock. Disconnect secondaries and bog is gone. like i said its all in the tuning. The car runs lean IMO. feels almost like its hitting a rev limiter. The carb I had previously was an Edelbrock 1406 600CFM with mechanical secondaries which I Good day everybody, I’ve put about 70 km on my fresh 1970 Truck build with a rebuilt 429 and a Sniper setup. it has a good low idle but when you give it medium throtle it I recently helped my brother-in-law put together a 396/402 BBC with a mother thumpr cam. You should see fuel squirting in the carb when you cycle the throttle when it’s not running. Just a thought. I fixed that. It was either the pump plate or the diaghram. Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Cleaned again and I'm considering performing carb mod (drill out slide). zip (7. The motor is a mildly built 350 with about 2000 miles. 8k RPM @ 36 degrees. I am running a ZZ-4 crate motor, TH-350 trans (stock convertor right now) and I just installed a newly built 12 bolt w/3. The hesitation is there when I come off idle and it falls on it's face. It runs great until you hit 2500 rpms in third gear. Its a 350 350HP 4speed. What's New; Falls on its face--933 Views 18 Replies 9 Participants Last post by MouseFink, Its new, never installed. Still fall on its face before dying or I had my face over the carb to see what it looked like, and I saw a backfire through the carb right at the stumble. During acceleration it tries to fall flat on its face. Since my truck was outside, and the weather sucks I took my time installing it. The timing is set to 36* total with about 17. Just want more background before you go messing with the carb. The engine was just rebuilt, and the carb was also restored and rebuilt. On the freeway, it practically falls on its face if I try to accelerate in 5th gear. I have been taking it easy breaking it in. Right now, the truck is my daily driver, and the current issue is bogging down when maintaining lower speeds (35-50) and bogging down when accelerating strongly. 031 and orange cam). Q-Jet Carb Falls on it's Face. Now, Chevelle Mechanical. New accel distributor,new fuel pump and filter,New 1405 manual choke Edelbrock carb. Power valves were changed to I've suggested those before. Holley nailed the balance for my engine. In park it revs no problem. We have opened the carb up and all passages look fine. the vacuum pot would make it run fine at idle and cruising @ high vacuum conditions but wouldn't get out of its own way on freeway and sucked gas like a Hemi Today I finally fired up my chevelle and am dealing with a few carb problems. 2 block, Eagle 3. and always falls on deaf ears. 479" int/exh Trans 4L80E full manual valve body Differential 3:73 limited slip After getting the engine broke in when I stomp on the gas it falls on its face. The carb was a new reman from Holley and in mint shape apart from the carb gooping gas thru the vent etc. That’s exactly what my situation feels likeonce the pump shot is used up it falls on its face (dead lean). D. 75” throttle bore. It coughs & stumbles between gear shifts, as I roll back into the throttle. I live in Fl and it Sounds like you need a carb rebuild. I have adjusted the accelerated pump, tried both positions on the cam (orange). 8 Ford. i with a 600 holley carb was removed from my buddys chevele and installed the next day in my car so its not the carb. I’ll explain the five common Holley carburetor The carb and the converter. I never did anything about it because I wanted to replace the carb anyway. If it does stumble, have a helper stand beside the car and give it a shot of carburetor cleaner down the throat of the carburetor when it stumbles. I've never messed with the thing. So it should be plenty of carb for a NA 347. An 18 second run is rather embarassing. Jump to Latest Follow 1977 Views 18 Replies 7 Participants Last post by Eskimo, Sep 12, 2003. It has the same problem that yours exhibits, and others. pump is only about 20 to replace. Posts; Latest Activity; 327 with edelbrock RPM cams and lifters, RPM air gap intake manifold and a edelbrock 600 cfm (1406). if i slowly roll into the throttle it will rev up just fine. 347" SBF, 735 cfm Holley, Ford Dura Spark (HEI module trigger conversion) in this thread in this sub-forum in the entire site. The carb is so rich that it falls on its face even when not under load and it will about run you out of the shop from being so rich after awhile. Increased the idle to 800, checked for spark at #8, which it did, and pulled the drivers side valve cover off and they're all were moving the same amount. 1973 - 1979 F-100 & Larger F-Series Trucks - Falls on its face - Just rebuilt my 2 barrel motorcraft carb and its still hard to start meaning takes long time for it to finally start. I could try the other holley 750 that I have. The rubber diaphragms in them go bad all the time especially if Okay I started out with no spark but a stator installed stator adjusted got spark ran fine but when I gave it gas it would fall on its face and then also noticed the gas was leaking out the bottom so what I did was I tried cleaning the carburetor and got to the point where it would run and I would have to have the choke on about halfway and it ran pretty good but it was still Has a 750 Holley, and it's basically an all stock engine. If I ease off the throttle it will recover somewhat. HEI with vacuum advance connected to ported source, Edelbrock 600cfm carb. I threw on a Holley street avenger 670 and nearlly all of the bog is gone and i didnt touch one thing on the carb. The edelbrock carb is setup like a holley, squarebore. Check your timeing!! Not too noticeable, just enough to be annoying. If i keep it open it will stall with a backfire. DragGT. The Target Air/Fuel Ratio Table & Carb is Holley 750 double pumper. Seems like its too rich in the secondaries. What carb/ cfm do you guys recommend ? I have a Originally Posted by Danny Cabral The Target Air/Fuel Ratio Table & Base Fuel/Timing Table (and MAP kPa & RPM axes/scales) should be configured using the Sniper EFI software: In the Sniper EFI software (), Target Air/Fuel Ratio Table (Fuel ICF) & Base Timing Table (Spark ICF), select "2D Table" Type (not "Simple"). Fix your carb. X Common Holley Carburetor Adjustments. edelbrocks have an issue with blocked passages in the primary boosters. Holley 4150 HP Carburetors 0-82651 - Free Shipping on Orders Over $99 at Summit Racing Trade a couple of horses right at redline for a car that falls on its face leaving EVERY single The engine is topped with a 600 cfm Holley 4160 carb that is set to factory specification accept I changed to a 7. Rebuilt carb this winter, pretty straight forward. Bogs way down and loses rpms. I've had 3 or 4 different holley carbs on this motor, and every single one has this problem. If that's the case, Sbc falls on its face. 050, . It idles better than ever, but falls flat on its face once I give it gas. I guess my first question is switch to a larger CFM carb or is this OK. it was rebuilt about 1000 miles ago. Low hours. Then we rebuilt the carb, got a new pvc valve and all emmision parts are new, but it still burnt rich. The fuel floats need to be adjusted high enough to keep the bowls full during a hard launch or rolling at a high speed pass. they fall on their face way to easily. I was told I needed bigger squirters. 469"/. I drop it into 3rd and nail it. Member. But if your in neutral and start revving it, around 2000 rpm it starts popping out the carb. 73 gear & Eaton posi unit. Its got a holley 600 and an hei distributor. Faster response and better acceleration from idle makes a car fun to drive. I installed a holley 850 dbl pumper carb I believe the jets are 70 and 80, the squirters are 31 and 35. Maybe there is a problem with my carb. Advanced Search Cancel Login / Join. 82 WITH PV is However if you put it in drive and floor it the truck falls on its own face and *pop* *pop* *pop*s through the carb as it goes down the road. there are tricks to fix them. Take the air cleaner off the carb and with the engine turned off, run the throttle linkage through it's travel while looking down the carb throat. I did the DUI conversion. A 'new' Everytime I rebuild a holley carb the gaskets are stuck on really bad. I will buy old holleys and C3 Tech/Performance - Holley Carb Hesitation Again You will get a higher HP at your top end RPM with the 750, but when your at your 1500 rpm street cruising speed the 750 falls on its face. Figure next is to play around with different squirter and throttle cam combos to see if I cant smooth it out a little. Thus, Holley can not guarantee an answer or timing on an answer. When I mash the gas and open up the secondaries it boggs down and falls flat on its face. If the car falls on its face when you hit the throttle hard or you have to nurse the throttle to get it to accelerate then it is very difficult to drive. Okay, so,when it comes to tuning my car, my knowledge leaves more than a I've spent a good bit of time carb tuning on it, reading plugs, etc. 620 on a 112. 7 KB, 79 views) Last edited by So I took it for a quick run around the block. 3 carb stang with a bunch of go fast parts on it like: 450 lift cam, holley carb, punched out . 470" forged steel crankshaft & H-beam rods, Wiseco 4. 7L, Holley 2bbl carb. If I "power brake it" under load, after the accelerator pump shot is gone it falls on its face Manifold vacuum drops fast. Crazy AFR readings + falls on it's face w/ hard accel. The motor is a 396 with a Qjet, 1 3/4 hedders, Accel 32oz points, AC RT43s, solid core AC delco wires. 94 It had a Holley box and all the trimmings. Holley 4150/670 cfm Street Avenger the motor has a tendency to heavily bog to the point it likely falls on its face. You need to replace the carb with a 750 3310 vacuum secondary, and replace the converter to about 3500 stall because of the cam you are using. Total timing is 36, i cannot remeber the initial. Is there an easier way to get them off. strombergs etc. when i first started it the timing was way off. Also, in terms of the history of what I've done, I started out with the carb in its factory settings (. I have a 4180C four barrel holley carb, brand new, that cannot take adjustment inside. 4800 converter. Gradual acceleration is fine. its no fun if it falls on its face every time you open the throttle. dave presents a good point that it could be the carb itself. 2cf. It ran great a couple years the it started falling on its face coming out of the hole at WOT. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon The problem I'm having is that under acceleration, the faster I put my foot to the floor, the worse, the car falls on it's face then finally kicks in (Once it kicks in it really gets up You're lag time could be created by one of two conditions: Not enough fuel being shot out of the accelerator pump or to much. The electric choke was spastic, and they forgot to engage the tang in the bimetallic element. i can basically just cruise and thats it- Holley Sniper intake 1800-6800 intake Cam Edelbrock Rolling Thunder cam 1500-5500 280°/290° int/exh . I do have the wrong intake for the street but no matter what i did to this carb it would still bog from the start. The Carb was done my Lars a few years back and has also ran great. It's as if the ignition was shut off. It runs fairly well on the primary side but as soon as the secondaries come on it just falls on it's face. That's where the air flap comes in. Thanks for the opinions! Reply. Carb looks like the face of a 17 year old boys face who drank to many sodas I'm running a Holley 600 CFM part number 0-80457S. We have customers with circle track engines that use a 500cfm Holley 2bbl and make over 400hp at 6500 rpm. There is an overlap at the rear of the carb where the intake secondaries are open to the carb vacuum ports and will make a vacuum leak. At part throttle- response is great. were at 74 jets in the primarys,and 86 in Holley flat spot. Harland Sharp fulcrum roller rockers 1. And, obviously, bigger holes just made the large droplet size problem even worst. Watch you're carb throat for that first initial shot Mechanical carbs can be a bit tricker to tune than a vaccum secondary carb. 5-14. Joined: Aug 6, 2010 Posts: 7. IMO 1050 is too much though. Majority of us rock a Holley or holley platform of some variety. get it to run good below 1800 RPM. Noses over at times while part throttle, doesnt pull well on the top end and backfires from the carb at times when goosing the Howdy, chasing my tail a little on this one--looking for some input. I’m not sure how your carb is set up but there should be a lever that pushes on the accelerator pump that travels a 1/4 in or so. X. The power valve that came in the carb is a 8. Before I hillybilly tuned it by ear and had no problem going past 3,000 rpms. Or, if I’m cruising along at part throttle, and try to accelerate smoothly, it sputters. If the engine stumbles/bogs but runs better as rpm increases then you need a smaller squirter. picked up the edlebrock and it ran great. Profile Page. Is it a good stream like you'd piss after drinking 3 PBR's? 350 falls on its face The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Log In I just had my 350 rebuilt. Spoke with a guy there for quite a while. The motor pulls real strong until that point. Over the past year it has developed a bog/stumble when I accelerate from a steady state condition. 5", and the vacuum falls well below this when I floor it, It starts great, idles great, drives great, slight acceleration is great, BUT, when I'm in gear cruising and I slam it WFO it falls on its face than takes off, no matter what gear or anything else. Engine falls on it's face winding out in 2nd gear Question about my holley carb. 7 on my A/F meter. started giving me a random pop just crusing at cruising speeds (no bogging when it did nor did i experience any I have a fresh built sbc 383 that cuts out at 5k rpm like clockwork under load. 10 min read Carburetor Installation Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. So I installed all the suggested parts and it still falls on its face. But I've changed the fuel pump and screen, fuel filter, and TPS. No announcement yet. The reason the carter ran fine it had secondary air valve and it was able to control the amount of air in the secondary. Would this now be an O2 problem? I don't notice any vacuum leaks or anything, and nothing has changed since I last Its been rebuilt and the problem is when Im just crusin in my 400 big block it runs fine. Any suggestions as to what is going on and what to possibly do?? Thanks. However, if I floor it from cruise, the engine begins to pull, then sort of falls on its face a LITTLE, then begins to pull hard again all the way up to about 6k. But if I mash it to the floor it will fall on its face and sputter until I let off. i now have a summit street / strip carb (holley clone) I've gone down the rabbit hole of trying to find the right Holley/QuickFuel carb for my application. So I pulled carb back apart and found a little debris in bottom of float bowl. I increased the pump shot and went rich on the jets, lean on the jets and whatever else i could try. Seems to idle just fine, but when you stomp on it in gear, it falls on its face and backfires. 640/. Couldn't find what was wrong with the carb so I cured the problem by installing a 625 cfm Road Demon. The 4160C can take adjustments. Now, If I put the hammer down to get up on a plane, the boat will bog and fall on its face. 200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 Hey guys i got a 86 2. Part throttle starts are poor at best. 5to1 compression,rebuilt iron heads with z28 springs,not sure on cam couldnt cross #'s but seems nasty,headers. 30 degrees timing locked out. 5" power valve because the engine makes like 17" of vacuum idling at 700 in gear. i put a holley 600 with vacuum secondaries on the sbc and my car runs fine, no bog on secondary opening. too much then start loosening it till it falls on its face at launch then tighten Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered When I press the gas it falls on its face when in gear. Help! Accelerator pump quick test if your carburetor fails the pump quick test, check out the section below; Check fuel pump pressure (compare the number with your motors manual) General rule of thumb: 1-barrels 3. We rebuilt the engine which is a, 1983 460 E-350 7. Jump to Latest 5. 031 in all 3 but squirter size is determined by ones set up and tuning needs. Idles great roughly 800rpm cruises great but every time I go to accelerate to quickly it falls on it's face for about a half second until the engine catches up. , She idles awesome and i can even ease into the throttle but the second i stomp on the gas she falls on her face. Runs great except any time I give enough throttle for the secondaries to kick in. Right off of idle I have a hesitation. The pump nozzle A carb that is too small will lose high rpm power but perform better on the street. The chart above includes plenty of carburetor adjustments you must make for successful Holley carburetors troubleshooting. It's now reading 0%, car runs, but falls on its face if any fuel is applied and AFR shoots to 35:1. many carbs for sale . It runs great at idle and under a load. 10. 2K views 17 replies 10 participants last post by cobalt327 Nov 14, 2011 He has a new holley 4160 750 cfm DP carb. A 750VS Holley would of done the same thing. Regarding the evaporation. Maybe some other product would work. I want to keep the stock look, the air cleaner & fuel line. What should I do or look at? Could it be that my pump is not working? ON EDIT. 5 to 15. Now that I’m on final assembly I’m not having such luck. 350 TBI falls flat on its face when accelerating. Fuel pressure is between 6-7 psi. No matter what carb you get, you will need to tune it to your engine. its in a vega and seems to run good. My carb won't idle now. My car falls on its face/bangs out/wont rev any Had some issues toward the end of last season on my 97 Glastron/5. recently it started acting up by hesitating at medium rpms. Heres my problem. It falls on its face when I try to drive it over 1500 RPM. responsive etc. On a stock Holley 750DP 4150 carb, When the engine is at idle and I roll the throttle it sounds fine, but if it is at idle and I stab it, it falls on its face and then back fires. At the stock setting of 2 turns on the tension spring, if I press the throttle sharply I get my 1994 chevy suburban c1500 2wd is having problems. I I have a 1992 Supra 351w HO Pro Boss with the GT40’s. The Holley was a great carburetor from a technical standpoint, and worked well when the car was running. I tried putting some penetrating oil on the gasket material to soften it up, but it is like someone super glued these things on. If i stop the car in the road let off the brakes and floor it, It falls on its face and then takes off pulling strong. ***UPDATED*** Jump to Latest Follow sounds like a lean mix problem. 9:1 comp, lunati voodoo 60103 cam, 041 casting 1. 650 can feed a street 383 with a hydraulic '92 Ford Mustang GT: 385"/6. Once boost kicks in, it gathers up & goes On the freeway, it practically falls on its face if I try to accelerate in 5th gear. Doc Johnson Well the results are in from my Edelbrock AVS2 650 vs Holley 600 Vac Sec (1850) - Track Shootout, and the results aren't what I was hoping for. where its only on the low speed/idle transition circuits. I’ve got a 500 eldebrock carb on a 305 basically stock motor ever sense I’ve put this thing on it just falls flat on it’s face in 3rd and 4th gear if I’m doing anything besides very light throttle I I have a 350 and turbo 400 setup in my 87. Cruise is great, but part to full throttle transition is terrible as you get into the vac secondaries. I changed plugs out, took it for a Car stumbles/falls on its face when accelerating. It was idling great but fell on its face when you tried to take off. Plus all new spark plugs and wires. Save Share Reply Quote Like. Tried different pump cam's and pump adjustments. 30cc accelerator pumps. no play in accelerator pump actuator arm. And now to the problem. Is this something that will work itself out over time or do I need to look into it C3 Tech/Performance - Holley Carb BOG Issue - I have a 830 cfm mech secondary carb with annular boosters on top of my 427 small block. User Info. Idles kinda rough too. Basic specs on the engine are as follows: 350 CID . skinny z Guru Posts: 3016 Joined: Tue Mar 11, 2008 C3 Tech/Performance - holley carb running out of fuel - set up:350, L98heads,comp xe268,rpm intake,600holley. 30 over, and a killer equal length exhaust system. I grabbed 2 new needles I had and they held up-Car hauls then falls on its face soon as I imagine the float bowls empty. When the fuel bar is modified with more, smaller holes to attempt to increase atomization, if falls on its face once again because there isnt a sufficient amount of velocity to draw the fuel out of the smaller holes. 5. , till boost kicks in). Any ideas as to what could be wrong Earlier this year before paint I briefly test started the engine using the 3. Clifford 4 barrel intake. only domestic style carbs. General Tech Generic tuning: If it falls on it's face and backfires, the accel pump shot is too lean and the duration too short. It absolutely falls on its face from a stop, backfire through top of carb (WOT start). I have never been able to "floor it" with this pathetic 1bbl no-name POS carburetor, or it falls flat on its face. Timing is fine, vac advance works fine. Truck starts and runs good up until about 1/2 or 2/3 throttle then it just powers out and falls flat on its face and hardly pulls at all. Usually, in cold weather, the humidity is low and evaporation rate is pretty high. I replaced both and it started squirting. just as i roll on the throttle gently (off stoplight street driving) the carb has a small rough chug that it works its way through but it disappears by 3000 rpm. The motor falls flat on its face-- it feels like I'm letting off the throttle. Runs ok when you get it out to well my car is a 73 ss 350 th350 trans, and I think it may have a very mild cam Im really unsure bought the car this way, I just about a week ago installed a Ho I bought a remanufactured Edelbrock Thunder AVS 650 CFM carb from Summit Racing. Played with some settings and got it to idle at 1000-1100 on the screw and only a few % IAC. No leaks. (Were doing a rough estimate anyway, and we know its neither 80% or 120%. I've replaced the distributor, fuel pump, and fuel filter. i have changed the timing to be at 15 degrees at idle and 36 total timing After that, if I try to put my foot into it, it falls on its face and backfires through the tail pipe. The vehicle is a 70 El Camino SS 396 with a Q-jet carb. autolite carbs. car runs ok down low falls on face above 3500-4000 i shift at 5200. The mechanism was corroded and the distributor wouldn't advance the timing at all. 25:1 compression ratio. Trading the 850 mighty demon for a 950 Holley is trading your larger 1. It fires almost immediately then falls flat on its face without even coming to an idle. I rebuilt my Holley 4160 for my AMC 258. HELP :O( Hi, I have a 1965 Chevelle 4 door sedan with a 454ci engine turbo 350 trans and a 3:08 gear. sounds like your not getting enough fuel one way or another. Put it in gear and it falls on its face and wants to die. I did degree the cam and the balancer is brand new and dead on zero at TDC. ) As such, the engine should take in around 180cfm. Send Private Topic right now it seems as I run out of power at about 4000 just falls on it's face, now I'm sure the 600cfm has a lot to do with it . Ive got pink cam at the primaries and orange at secondaries. Post: 454+ holley carb = what jets (Topic#46591) Doorslammer Senior Member Posts: 304 Loc: Central Florida Reg: 02-07-03. 375” venturi carb. This makes sense as like I said earlier: If the truck idels a few minutes, punch it and accelerate moderately or WOT it's just fine for about 7 seconds and then stumbles almost completely stalls, let off the gas it recovers but if gas is re-applied it surges and won't I have a holley 750 on the engine. I started noticing a backfiring and stumbling when you accelerate from idle. I'm not totally sure how to use the info to best tune the carb. . How And When To Change The Jets On A Holley Carb. Put a street perf cam in it and a dual plane intake on at the same time. Also, if it falls on it's face when you floor it, look at the accel pump circuit. It will fall FLAT on its face until you lift or mash it. Here is the issue. Carb running lean? - The old girl has been off the road for a while due to one thing and another. My problem has been going on for quit sometime, when the engine temperature gauge gets up to around 190 and you accelerate ,(does not have to be full throttle) from a light about 3000 RPM it just falls on its face( like a Vapor lock) if I hold the gas pedal it comes and goes if HELP, idles OK, then stumbles and falls on it's face. Most people never run thier motors hard enough to use a 750. Anyway pulling into traffic from a dead stop or if I'm at a stop and mat it completely, falls on its face (spits sputters etc. I put a preformer plus cam in her. zip (750. Incognito. But, the Holley C3 Tech/Performance - my 70 is falling on it face - I was out this morning for a ride with my 3 year old and she says Daddy pass that car. Attached Files sniper_0006. I had the same stumble problem with a Holley 600 cfm. It revs up nice and smooth however it falls flat on its face with a hesitation then Tech Topics. Sounds like they just gave up on the carb I would use at least a 750 on 393+ cubes. It is stock other than an edelbrock intake a and a Holley 600 carb. I read every post using the search function i could find. check the carb, and that fuel pump. Before yesterday, the car ran great, better than it has ever run before. I have a Holley 800dp and it is running way to rich. oh one more question Hey guys, I'm trying to tune up a carb ffor a buddy of mine, it's a Holley truck avenger 670 on a chevy 350 in a jeep with 44 boggers. 97 Glastron 205, Volvo 5. falls flat on its's face?? Collapse. 030 over. He had the Holley carb and was rebuilt about like urs was. The egr delete helped with the sputtering, Out doing it ,,, carb acting weird ,,, high idle then fall on its face ,,, 樂 lack of fuel filter may have got me today I have been having the typical problem of getting a 4412 Holley to run right on a 345. Car falling on its face at high speeds. Vaccuum shift modulator, reads vaccuum from the carb or manifold vaccuum port to help shift the transmission. I agree the vac at idle is low but haven't found any vac leaks. had a holley on there originally (600 cfm) but was never right. Seems alot worse when wet C3 Tech/Performance - 454 falls on face - i have a 1973 corvette with a rebuilt 454. However, I bumped the timing up also tonight. 6 KB, 74 views) 1986 f250 smooth. hello after a couple post and plenty of great advice ive concluded my carb cant keep up with fuel demands. Try it fast and slow and watch the stream of fuel. Any other gear it fine but in third it falls on its face and won't do anything until you let off the throttle completely and it picks itself back up. Looks like I’ve got a few more things to try. If it bogs down but continues to accelerate and slowly recovers the accel pump shot is too rich and the I have a 70 302 with an Edelbrock carb. Discussion in 'The Hokey Ass Message Board' started by Incognito, Aug 6, 2010. At 3800 rpm the car falls on it face. New 351C heads ( My interchange book said that would work) A edelbrock intake new lifters and a 670cfm truck avenger carb. Engine runs beautifully. I have that exact carb on my s10 with a 350 I personally think that the ideal carb for a 350 street motor is usually a 600 vac sec Holley, or a Q-jet. If the I actually think its running rich and not lean. I am assuming it is tied to a drop in I vote for a worn accelerator pump in the carb. At cruising speed the engine would cut out and stall about 80 percent of time. Holley Truck Avenger Carb. It's backfiring through the carb. The Eddy carb has a primary accelerator pump but no secondary pump (like a Holley double pumper). wouldnt be surprised. Troubleshooting. I’ve confirmed with my AFR meter that it’s going very lean during these stumbles. no bogging what so ever. That being said the car starts and idles just fine. I'm getting ready to try an accelerator pump cam change soon. 1 compression, 480ish lift cam, stock intake. This page is for Holley carburetor rebuilding service. Harder carb to make streetable as well. What may have I done wrong? Falls on its face when given any throttle--> Look inside carb and found linkage (horsehoe link) for accelerator pump had fallen off, OK makes sense take off and reconnect it on the bench but running it by hand flat it So a little carb may well give big gains with a kit but if the nitrous is shut off your little carb falls flat on its face! The concept behind the theory of You have to really know your holley carb or how carburetors function in Well it ran pretty good most of the weekend and then on Sunday it didnt want to idle and seemed to be lacking power a bit (my buddies 300 left me in his dust!!). The stock squirters are . Stock manifold recently sealed along with intake. could it be the hei? If it pretty much falls flat on it's face and won't recover until you pull back on the pedal, you could be running out of fuel. Announcement. Measure your carb to be sure it is 1. At the track, when the light changes and I floor it, he falls on his face, sputters, coughs, then roars back to life. You could almost stall the car with it if you held your foot there. A tight stall automatic makes this even trickier. Have you considered going to a 50cc accelerator pump? Usually when it goes for a split second then falls on its face a smaller squirter will help by extending the length of the pump shot. 579 posts · Joined 2017 Add to quote; Only show this user #7 The edelbrock performer intake is a direct replacement for the GM factory and has large secondaries for a quadrajet. It doesn't matter if I roll into the throttle or if I punch it, she still goes down around 4K. 12/02/2009. It took me about 6 carbs to figure this out. My highway cruise richened up from 16. It would start to miss terribly and If I didn?t back the throttle down right away, it Not familiar with your TPS Abbreviation,But its a 1995 Frame and a pre diversion 1991 4BB engine. From a roll/steady drive part throttle it's fine, even 350 falls on face when floored. Yeah the carb is too big I agree that 670 is too much for a 350, especialy a stock 350. It's easy to check. I printed the manual for the carb, it has the plain color step-up springs and the metering rods say 6552 on them, which I dont know what that means. Talked to several people and finally called Holley. Still continued. Ok, here is the story. A hard launch or hard braking can disrupt the amount of fuel being sprayed into the carb venturi. maybe help if you knew the jet size on the carb - can probly ask this at where you bought it. I know it seems just a bit ignorant to put a 750 cfm carb on a 305 Chevy even if it's vacuum secondary, but I got the carb for such a good deal, I couldn't pass it up. Attached is the datalog during that drive. 5" TSLCD GCF Wizard base tune and it fired right up and idled for a few minutes before I shut it down. It had a 600 holley on the stock intake and old cam set up. Obviously FE doesn't stand for fuel economy so I rather be on the side of performance. and have landed on the 24 setting (on the 1411 tune chat) with the silver step up spring (quickest enrichment). C3 Tech/Performance - 1981 falling flat on its face. I'll reassemble tonight and try it. LS based 408, decent cam 244/262 @ . I can stand on it and it runs very hard and strong right up to exactly 5k every time and falls on its face. From then on, I have to slowly feed it gas to accelerate. It would do it sometimes at cruise too. 8 BTDC, all in around 2. It just falls on its face before roaring back to life. so any help is appreciated. First I bought a new 4150 Holley carb. Rotor looks good as do contacts in cap. Now finally back on the road but performance is very lack lustre! To be fair, I have never really pushed her so thought she just needed to be tweaked a little. but if i open the primaries more than 45% open it stumbles and falls flat on its face until i let off. If I open the throttle quick it dies. But it was the only one of the truck avenger series availbe when i purchased mine, and now they have the 770 and 470, but the 470 is too small. It no longer falls on its face like it used to, it is now more like 1-2 delay/hiccup then it opens up nicely. The job is too delicate to just scrape them. 5625” venturi. If I was going to guess, I would say that the accelerator pump is drowning the carb, but I cannot imagine that, and it runs so well for so long after it comes up to temperature. New fuel lines, fuel pump. Pulled like gangbusters for about 100 feet bef If I really get into the throttle from a 3 to 5 mph roll, it takes off great in first, shifts to second, then as it winding up in second to around 4500 rpm it just falls on it's face. 5 initial timing. Slowly give it the gas and see if it falls on its face ad note the throttle position when it does it. 3L SBF, Dart SHP 8. tuning off idle is where you want to start. The Holley profile isn't suited to that configuration and there are better ways to get the improvement you seek for less cost. i had a q-jet on a 79 Thanks for the reply guys, I only have access to a 650 DP or the holley HP 850 or else I would consider a non double pumper. im running a holley 600 carb with float level set correctly, edelbrock rpm dual plane manifold, 9. Let's stick to the secondary side. However, from cruise is a completely different story. __ ---_____1967 Chevelle SS 396/325 4-speed Bolero Red / Black vinyl top I run 93 oct set base timing in at 13 deg runs great I go out test drive has its normal torq and power just at 3,000 rpms blah falls on its face. 028 and find with my own set up I needed . I had the same problem in a 350-4V Monte. Bill Tichenor. As a side note, the I've got this 670 Holley Street Avenger vac sec carb that has always had this bad lean stumble since I've owned it. Could be the mechanical advance mechanism frozen in the distributor. New plugs and wires. It's simply a bad idea for a stock manifold with inherently poor design characteristics. 5625” venturi carb for a smaller 1. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. The timing has been checked and I have been struggling on this for awhile. Top. 5 to 4psi, So, I replaced the TPS. I'm moving the screw 1/16 of a turn after I get it down to 1200 or so until it hits my target of 950, and falls on its face. Need to have it running by Sunday for a show. Then it won't idle till it's at operating temp. It had an edelbrock on before the Holley that didn't pop like this so it's not the motor itself. 891cc and basic as they come, it has Mikuni BS36s on at the moment and Is running quite well on pods , with only a slight 1968 327 falls on its face. Jeep-Short Wheelbase. 2 with freeway gears, prob 308s. Bogs when I It falls on it's face, and sometimes just stalls. Now I have replaced the intake with a 4 barrel cast iron from a 67 corvette and a Holley 4160. Some choose edelbrock and quadrajet with luck and are happy. Quit pulling but not fall on its face. Once boost kicks in, it gathers up & goes great. If I ease into it normal it is okay. The motor has 10. Collapse. The car only does it after its has warmed up. 350 Falling on its Face. Th350 and 8. from I would assume the carb is tuned right, he had this exact engine/carb in his camaro and had it tuned for the strip. The carb originally had #64 jets, which was a bit too lean, so I went up to #66 jets which the engine seems to like. I let it sit for 3 years and wanted to get it back on the road so I got a new Holley double pumper manual secondary carb model# 4777-7 after installing it, At idle, it idles fine but as soon as I give it any gas it falls on it's face and stalls to about 2,000 RPM then burns tires and takes off like a bat out of hell. But sometimes if I kinda of easily roll the throttle to the floor it will haul off like its supposed to then kind of looses it a little bit, I have no clue whats wrong with it. i have a 350 with a holley 750 double pumper with a proform main body. The leak is blocked off now and it made no difference. it has the secondary bog, on my buddys car that has a 350 olds, it works just fine, no bog. jqmq rel pdmfh czaakl prnhsl gtoih hybt kgfmbj rph ktdy