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The most common reason for backfire in an engine is the timing is not set correctly. The bad timing could also be caused by the timing chain beingworn out or a camshaft that is worn out. Get a timing light and check to see what the timing is set to. It should be around 8 to 12 degrees before top dead center at idle(800-1100 RPM) with the distributor's vacuum advance disconnected for most Chevy small blocks. There should be a sticker in the engine compartment that gives the idle speed and timing spec. for that model. If there is not sticker, the spec. above should correct your problem if the parts mentioned are in good condition (not worn out).
What else can I help you with?
What would cause 2001 mustang cobra to not start?
its got toothpaste in the carby
What would cause a 1999 durango to backfire while driving but not while at an idel?
Bad spark plugs, spark plug wires or distributor cap and rotor.
What would cause 1986 454 to backfire through the exhaust while idling?
Plug wires installed incorrectly. Click the link.
Why would a 1973 Volkswagen bug keep stalling?
Take out the idle jet on the side of the carby and give it a good blow out. If this fails clean out carby. Another quick fix that sometimes works, take off aircleaner rev motor hard and put your hand over the top of carby. Your hand will be sucked down and this will usually dislodge any blockage in carby. Remove your hand before motor stalls!
What would cause 1991 mr2 to idle at 3000rpm?
check for a loose or broken vacume line on the engine probably on the intake
How would you fix a stuck throttle on a dirt bike?
i find usually its the carby... either u need to lube up the cable, buy a new spring for the carby as it mite just be old and to weak to pull the cable back down or if all else fails just buy a new cable.. cheap fix... but if its not the carby.. i cant help ya lol
Would no catalytic converter cause backfire?
Having no catalytic converter installed is illegal and can cause a myriad of problems. Probably not a backfire though.
Why would my 84 305 v8 backfire.?
it's lean
Why would my 86 bronco 2 stall when put in gear?
Try checking the intake manifold or carby for a vacuum leak.
Why would exhaust gas come out of your carburetor?
backfire timing off
Why would an arctic cat ATV backfire?
from unburned fuel in the cylinder
Why would a 1999 Plymouth voyager backfire?
timing or a plug not sparking
