Hmm, changed the alternator and no more backfiring exhaust
#1
RotatingCheesehead
Thread Starter
Hmm, changed the alternator and no more backfiring exhaust
I changed the alternator on my 1979 RX-7 over the weekend because the old one basically died on me at a stop sign. Pretty embrassing thing to happen during Friday rush hour. I used to have a nice gurgly backfire with my RX - nothing obnoxious - for the first couple of miles after startup when coasting to a slower speed in 3rd or 4th gear, for example. Well, that backfire has been eliminated with the alternator change. Had to tighten up the belts a little too since they were too loose. I am really happy with the change. The car just seems to run a lot smoother.
#4
Yeah, shutup kid.
Kinda makes sense. If you had a shitty alternator you probably had a really weak spark and it wasn't burning all the fuel. Now with a good alternator the spark is a lot better and it's burning all the fuel, so now there's no extra fuel to go into the exhaust.
#5
Same thing happened in my 91. It wasn't backfiring more than usual, but it was running a bit rougher, which I thought was dirty fuel injectors or something. My alt belt started slipping, I tightned it (too much), snapped it, put a new one on and tightened it to proper spec, car runs much much better. I don't know exactly why, but weak spark could have been the issue.
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