bump

 

riceburner, you might have a exhaust leak, when things heat up, they expand and the leak got sealed... just a guess though... I use to have a exhaust leak (you can hear it) but only when cold, you couldn't hear it after the car warms up.

 

check your timing

 

And your exhaust system for a leak...

 

watch out for leaks around the header, if that gasket is toast your car will backfire like crazy, also you can warp the **** out of your header. this happened to me and i had to get the header milled then put in a new gasket and tightened it up, no backfires since!

 

the engine get so fueled up that when u shut it off raw fuel goes down the exhausht and back fires.just let it idle a while then shut it off

 

hello 2005!

 

Check your alternator.
I had the same problem with my 1979 RX-7. One massive backfire and suddenly my original alternator died. I replaced it with a brand new one and the backfiring stopped - though not completely. On cold mornings, when the engine is not yet burning up all of the emitted exhaust gases, you can expect some RX-7 cackle in the back and maybe some loud bangs once in a while. May the local cops show you mercy.

 

Interesting, Markusr2001. I just rebuilt my carb (was full of rust), and the first time I started it, the alternator, or external regulator (its a 1979) have gone out. it's running rich, but your alternator replacement makes me want to get that done first. I've tried turning both the idle speed /air adjust screw, and the idle mixture screw all the way clockwise, and the engine still idles, the exhaust has a dark tint to it.