Backfire sound - 'popping'

galantejNovember 2, 2005

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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galantej

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

    Bookmark   November 2, 2005 at 1:59PM
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ericwi

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

    Bookmark   November 3, 2005 at 8:42AM
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timbulb

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

    Bookmark   November 3, 2005 at 9:37PM
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jemdandy

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?)

    Bookmark   November 4, 2005 at 12:20AM
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galantej

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.

    Bookmark   November 4, 2005 at 2:03PM
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ericwi

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.

    Bookmark   November 5, 2005 at 12:30PM
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mikie_gw

Sounds like elcrapo gas or fueling problem.

    Bookmark   November 8, 2005 at 9:57AM
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earthworm

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..

    Bookmark   November 8, 2005 at 12:18PM
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mister_h

I think JemDandy's diagnose is the most probable. The question is why isn't EFI providing correct F/A ratio?

    Bookmark   November 8, 2005 at 3:59PM
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