what causes afterfire?
11-25-2003, 05:56 PM
#1
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Car: '84 Z28
Engine: 350
Transmission: th2004r
what causes afterfire?
i was wondering what causes the afterfire you hear when you let off the gas. i heard on here that it was the unburt fuel in the exhaust burning in the exhaust, but what actualy causes it? bigger cams? smaller cams? better flowing exhaust? thx.
11-25-2003, 06:52 PM
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Car: 91 Camaro RS
Engine: 305 LO3
Transmission: 700-R4
I know running rich can cause it. mine has done it since the day I got it.
also mine will shoot aprox 4 inch flames out of the exhaust manifolds if I remove the bolts plugging where the air tubes use to be.
gives a nice little show at night lol
also mine will shoot aprox 4 inch flames out of the exhaust manifolds if I remove the bolts plugging where the air tubes use to be.
gives a nice little show at night lol
11-26-2003, 08:38 AM
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Car: 91 RS, 00 TA Ram Air, 86 IROC
Engine: 305 tbi, LS1, 355
Transmission: 700R4, 4L60E, 700R4 NonLU
Lots of overlap and lots of fuel, high engine speeds, sudden decelleration, make big boom. Sometimes a backfire is caused by cold air entering the hot exhaust system during decelleration.
Check your exhaust system for leaks and maybe that wil fix it.
:rockon:
Check your exhaust system for leaks and maybe that wil fix it.
:rockon:
11-26-2003, 08:41 PM
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Car: 1990 IROC-Z
Engine: 383 HSR
Transmission: 700R4
Axle/Gears: 3.70
I'm not sure what causes it but I get several "pops" when I'm downshifting and off the gas. You know, like you do at 95 when you see a cop!! My motor is almost stock but I believe it is running rich.
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