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.

 

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

 

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:

 

mine dosn't do it much...i wish it would though.

 

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.