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Backfire sound - 'popping'

Posted by galantej (My Page) on
Wed, Nov 2, 05 at 13:41

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.


Follow-Up Postings:

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RE: Backfire sound - 'popping'

Oh yeah. It is an automatic transmission if that is any help.


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RE: Backfire sound - 'popping'

What kind of vehicle do you drive? How many miles are on the odometer? Which octane gas do you use?


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RE: Backfire sound - 'popping'

It's that coffee can muffler tip you put on.


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RE: Backfire sound - 'popping'

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?)


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RE: Backfire sound - 'popping'

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.


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RE: Backfire sound - 'popping'

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.


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RE: Backfire sound - 'popping'

Sounds like elcrapo gas or fueling problem.


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RE: Backfire sound - 'popping'

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..


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RE: Backfire sound - 'popping'

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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