exhaust backfiring
09-01-05, 03:25 PM
#27
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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.
09-02-05, 10:48 PM
#30
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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!
07-16-07, 01:05 PM
#33
RotatingCheesehead
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.
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.
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toddk042 (06-06-18)
06-06-18, 11:20 PM
#34
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.
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