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Discussion Starter · #1 ·

I've had a problem with my sentra backfiring whenever the engine is slowing down. It used to be once or twice a day it would do it, now it's doing it all the time, even when I'm accelerating.

The car has 137,000 miles on it. Tune ups never seemed to affect it and I have asked mechanics to check the timing and they always said it was ok. I replaced the spark plugs, wires, cap, and rotor about 10,000 miles ago. It seems to have gotten worse as the weather gets colder, although that may just be a coincidence.

Let me know if I left anything out.
Any help would be appreciated



Still moderating..sorta
1,324 Posts
I have the same problem as you, and I've tried the same things too. I think the TBI just doesn't have the ability to mix the fuel that well and causes some unburnt fuel to enter the exhaust system causing the backfiring.
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