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Backfire sound - 'popping'

21 years ago

Can someone please help me out? Just recently, I have noticed a 'popping' sound whenever I accelerate from a stop and also when I decelerate and come to a stop. I changed the spark plugs and wires last night to see if that was an issue but it still made the sound this morning. Any ideas? Solutions? Thanks in advance. I just found this site and it's awesome.

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Comments (9)

galantej
Original Author
21 years ago
Oh yeah. It is an automatic transmission if that is any help.
ericwi
21 years ago
What kind of vehicle do you drive? How many miles are on the odometer? Which octane gas do you use?
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timbulb
21 years ago
It's that coffee can muffler tip you put on.
jemdandy
21 years ago
A popping sound in the exhaust on de-acceleration may be caused by the fuel mixture leaning-out. (It was the exhaust, wasn't it, or was it something else?)
galantej
Original Author
21 years ago
I drive a 2000 Galant ES, 130K miles and typically use 89 octane.

Yes, the sound seems to be coming from the exhaust. I thought about checking the fuel filter but wanted to get some other ideas.
ericwi
20 years ago
I am stumped by your symptom as described. I have heard backfiring on deceleration, and it sounds nothing like the noise that comes from pre-ignition in the engine, that can occur during acceleration. A hole in the exhaust system would make noise all the time, although it would quiet down some during deceleration. Given the high miles your car has, its probably time to get the exhaust looked at.
mikie_gw
20 years ago
Sounds like elcrapo gas or fueling problem.
earthworm
20 years ago
Certainly no fuel filter would be a cause; but this is a service item that should be changed every 50K or so, depending on the manufacturer...
Maybe the catalytic converter is failing, allowing unburned gas to enter the exhaust.
But, this condition should cause a code..
mister_h
20 years ago
I think JemDandy's diagnose is the most probable. The question is why isn't EFI providing correct F/A ratio?

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