Footage taken from Holley Carburetor Installation & Tuning DVD
Пікірлер: 64
@feeneysmechanical62152 жыл бұрын
Another reason for a back fire through the carb. Is plug wires that weren't installed correctly on the correct cylinders. Also a oil pump that locks up a little and twists the drive rod from the distributor will cause a backfire
@geddon814 жыл бұрын
My truck just got converted from EFI to carb, have a holley 4bbl on it. WHen I got it back she had some trouble spots here and there, over time of driving it I decided it was time I take a shot and tune the damned thing myself lol. Well I did it, started from zero and tuned the carb until she felt smooth and no popping or hesitation could be felt . After awhile I finally got it, or so I thought. She was riding beautifully , the 454 its attached too running calm and steady. Then all the sudden tonight while giving it a bit more gas than usual a massive pop and a good plume of smoke made its way out from under the hood. For 2 days she never had an issue, then tonight I thought I blew the damned thing off the intake lol. Pulled over and popped the hood to make sure there wasnt a fire or anything and nothing, just spit a big flame and she was back to being smooth . Before I re-tuned I can tell you she was definitely running a good bit rich so I made sure and kept it a bit leaner than where the installer had it. Now I dont know if I need to go more rich or even more lean lol. Find out tomorrow I guess .
@charleshorseman55 Жыл бұрын
Whelp, how did it go?
@kekistanimememan170 Жыл бұрын
Should have stuck to EFI
@Good-Enuff-Garage8 жыл бұрын
so pretty much check everything, ha ha, great got it
@kaloosh26392 жыл бұрын
😂
@Dubtee Жыл бұрын
Holley makes the most useless videos.
@1badombre82 Жыл бұрын
Lol did that twice already. What next?
@johngranato26733 жыл бұрын
...and if you have power brakes, make sure your booster is not damaged and creating a vacuum leak. Disconnect and plug the booster to intake hose if any doubts.
@pigeonsil240sx Жыл бұрын
whats the theory behind it though? for example if you have bad plug wire how does it even fire in that cylinder? i understand how bad timing could cause this but i dont understand how this would accure if timings fine? the fuel sprays as intake valve opens,the piston goes down to draw in air and as it comes up the valves close and combustion accurs so if cars timed correct how is faulty plugs/wires/fuel create the backfire?
@zainulabideenzain35 жыл бұрын
Upon wide open throttle, my car intermittently gives severe jerks/misfire. This started happening after rebuild. What could be causing the issue? Can the large jet cause this problem?
@HolleyPerformance5 жыл бұрын
There are a number of factors that can cause this. Did it do it before the rebuild? If not, then I would check things like ignition timing! Also check fuel pressure, then look into carb jetting and accelerator pump operation and settings. Thx J
@zainulabideenzain35 жыл бұрын
@@HolleyPerformance It did not do that before the rebuild. I replaced the whole carburetor with a new one, and problem solved.
@HolleyPerformance5 жыл бұрын
@@zainulabideenzain3 I would have to guess then that something was installed or assembled incorrectly when the rebuild was done. Glad you figured it out. Thx J
@lpcal8863 Жыл бұрын
I have a 1990 Dakota sport (3.9 V6) and they use a Holley EFI carb. I’ve had stalling and tough idle issues but yesterday I had a backfire. I immediately replaced the ignition coil, plugs wires, and spark plugs, as well as cleaned the EGR valve. What else could I do before I have to take it to the shop and have them check the more complex stuff?
@gagehowell35666 жыл бұрын
Thank you so much, a few of these I knew but a few I didnt!
@charleshorseman55 Жыл бұрын
Had a quadrajet on the 360 ramcharger, ran like ass after a rebuild, put a holley on, backfires every 1/2 second out of the carb. Checked the electronic choke, wire wasn't connected. Connected the wire, now it backfires every 1/2 second LOUDLY lmao. Send help.
@equittone18393 жыл бұрын
Sorry for my bad english, my carbs just blipping when the engine is cold (if i rev it) when the engine already hot it runs normally, is it jetting problem or do you know the problem? 🙏
@gtzglvez2 жыл бұрын
Check distributor cap to see if its craked in any way along with ignition rotor..
@THE.PUNISHER935 жыл бұрын
thank you so much
@richardmckibben2384 Жыл бұрын
Sounds good 👍
@jessewhite340815 жыл бұрын
Forgot to mention improperly adjusted carburetor will do the same thing edelbrock 1406 is really bad about this
@78ramcharger532 жыл бұрын
I'm having problems with mine right now.
@whodatisful5 жыл бұрын
That narrows it down
@nicks.carter5746 жыл бұрын
DISTRIBUTOR MAGNET OR SPUR ALSO !
@avocatsyria8 ай бұрын
Is this fire dangers, i mean is there any chance to fier all my car 😢?
@mclarpet5 жыл бұрын
I'm on fire, I'm on fire, I'm on fire......
@HolleyPerformance5 жыл бұрын
Funny!, but not Funny if it has happened to you! :O
@mclarpet5 жыл бұрын
To be sure. We were told about never looking down an operating carb when we started dynamometer at a uni.
@slapkickinmule5 жыл бұрын
@@HolleyPerformance Hi, so, I normally work with computer controlled fuel injected stuff or diesels, but I got a motorhome with a 454 big block, and it was leaking gas, burning very rich, and eventually one of the back fires ignited the gas that was all over the engine block crisping and shorting all the wiring as well as melting the vaccum hosing, the components between vacuum and electrical lines seem fine, but I'm not sure where to start after cleaning off all the fire extinguisher dust
@HolleyPerformance5 жыл бұрын
@@slapkickinmule I'd remove the carb from the engine and try cleaning it up good with some carb cleaner and a brush. Then disassemble it and try to determine and correct the leaking issue. Thx J
@user-jq3wn6kr2n4 жыл бұрын
Please i have a superban 92 engine 454 that works two hours and then stops suddenly and a fire occurs from tbi And I replaced all the sensors and everything and I couldn't find a solution
@bradking21132 жыл бұрын
I have a 450 slayer quick fuel carb that does that all the time idles beautiful but as you give it a quick boot it backfires up through the carb its just a piece of junk,waste of money that was, put the holley on no problems at all
@jadenrhines2345 жыл бұрын
Mine does fine until it’s over 1/2 throttle, then it bogs down and eventually will come out of it. It also gets better as it warms up more. That means it’s too lean right?
@HolleyPerformance5 жыл бұрын
It could be too lean or too rich! Does it pop back through the exhaust or air cleaner? Does it do it when you roll into the throttle or just when you punch it? Best thing is to pull and read the spark plugs. If it eventually comes out of it I would say the main jetting is fairly close and maybe look at other areas (squirters, power valve, etc). You also need to check your timing and make sure that the mechanical and vacuum advance in your distributor is working properly, as well as all the other ignition components! Thx J
@jadenrhines2345 жыл бұрын
HolleyPerformance thanks for the help!
@YayArea41553 жыл бұрын
@holley my skylark is having the same issue but it back fires trough the carbuator only when i snap tue throttle .
@crack32732 жыл бұрын
Can you remember how you fixed it? My car is doing the same exact thing. I've changed spark plugs, cleaned the carb and checked the vacuum advance.
@YayArea41552 жыл бұрын
@@crack3273 just fixed the issue it ended up beign the cam shaft replace camshaft and lifters issue resolve.
@freddiebryant89327 жыл бұрын
agree
@drakesairguns78484 жыл бұрын
well... i have everything on the problems list...
@ProxyofMalice4 ай бұрын
E e dd dv
@cfazekas044113 жыл бұрын
I just built a single silinder race motor and it backfires through the carb all the time
@mk6744-5 жыл бұрын
Little bit late but your timing is Off bro
@samsquires28776 жыл бұрын
How to fix this problem convert it to EFI.
@TheWolverine-rm2kr5 жыл бұрын
Efi doesn't fix the bad timing chain, cam, timing off, or bad distributor
@elroyslater84619 жыл бұрын
What about wires being mismatched
@apriljones84797 жыл бұрын
yes
@richk.40206 жыл бұрын
then your motor would be missing, you would know that!
@brooklyncarsandcoffeehealt43295 жыл бұрын
Will a bad power Valve can also backfire?
@HolleyPerformance5 жыл бұрын
When does your backfire occur?? (ex. Idle, hard acceleration, WOT, constant cruising speeds, deacceleration)?? A blown Power Valve acts like it is open all the time resulting in a dramatically over rich fuel mixture at idle and no response when trying to lean out the Air Screws. The most common cause of a backfire is ignition related, possible causes could be that the timing is off, too much or too little mechanical/vacuum advancement, or possibly a bad cap, plug or plug wire. Thx J
@crystalwynia23524 жыл бұрын
@@HolleyPerformance We have a 454 mercruiser 7.4 liter in our boat, carb has been rebuilt, new mechanical fuel pump,new distributor cap, new plugs and wires but we are still having backfiring when we are at WOT then we slow down and the backfiring continues at lower rpms as well. It doesn't start off backfiring at low rpms only after we got up around to 3 to 4k rpms. Any idea? I'm thinking timing issue...
@66mustangdriver111 жыл бұрын
your ignition timing is off.
@MrKIKO7145 жыл бұрын
I have this problem whit my carburetor, how i can turn on the ignition timing
@carlosspears46374 жыл бұрын
When I crank my 98 grand marquis up, the carburetor backfires, but when I plug the number 7 plug wire off it stops.. can someone help me
@carlosspears46374 жыл бұрын
When I unplug the number 7 wire it stops,, sorry
@ll69464 жыл бұрын
Bad spark plug?
@firstname13803 жыл бұрын
Think you forgot if your car is smashed and if the engine isn’t in the car all the way
@dirtbikeboy81694 жыл бұрын
Mine runs and ideals fine , until I rev it , it back fires out of carb
@HolleyPerformance4 жыл бұрын
You may need a larger accelerator pump nozzle, or it's possibly your accelerator pump linkage has too much slack in it.