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Old 10-08-2008, 10:23 AM   #1
redcannon
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2002 SL
Default 'popping' sound coming from engine

whenever my car is turned on I hear this random knocking sound coming from the engine side of the firewall. It kind of sounds like popping gunshots but muffled. I don't think it is my engine pinging because I filled it up with 89 (instead of the normal 87) and the sound was the exact same in every way with no improvement.

The sound happens perhaps 150/minute, and because of this I don't think it is coming from the engine. I can only hear it while idling though, so I don't know how it sounds when the engine is above 1000 rpm.

A friend of mine said it was the power steering, but that just doesn't make a lot of sense to me. My god, I now have three living threads and they all have to do with my car making questionable sounds.

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Old 10-08-2008, 01:39 PM   #2
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Default Re: 'popping' sound coming from engine

Could be the catalytic converter. Get under the car and knock on the cat with your fist or a rubber mallet. If it sounds like marbles in a can, then the catalyst is starting to break up.

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Old 10-08-2008, 08:19 PM   #3
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Default Re: 'popping' sound coming from engine

god, this car is falling apart!

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Old 10-16-2008, 10:08 PM   #4
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Default Re: 'popping' sound coming from engine

well, I didn't have any odd sounds from the catalytic converter. What could it be? It is an erratic sound, and it is random. It is also annoying.

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