Engine Knock
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Joined: Sep 2002
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From: Rye Brook, NY
Engine Knock
What exactly does knock sound like? The car seems to drive fine, but there is a banging noise. It sounds like it could be a loose exhaust pipe or header,etc., but I'm not sure. I notice it mostly in park. With hood up, it sounds very low in the engine compartment. Any suggestions? BTW, Just had a Tunnel Plate installed. Thanks.
Le Mans Master
Joined: Aug 2000
Posts: 8,762
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From: Murphy TX
If you knock bad enough to hear it, it sounds like, as best I can describe, like wrapping a metal wrench in a towel and hitting another heavy piece of metal. Kind of like a very short/intense thunk.
Ping on the other hand sounds a little different, much higher pitch. I had horrible pinging in my '01 on a dyno once and it sounded like they were making popcorn under the hood... ick.
If you're hearing a less muffled banging, I would suggest is is probably something loose and not engine knock, especially given your recent install. The exhaust has to be dropped for that install, and maybe they missed a hanger or something? or didn't tighten something up?
Also just saw you heard it mainly in 'Park', doubt highly you'd get any knock at idle.
Ping on the other hand sounds a little different, much higher pitch. I had horrible pinging in my '01 on a dyno once and it sounded like they were making popcorn under the hood... ick.
If you're hearing a less muffled banging, I would suggest is is probably something loose and not engine knock, especially given your recent install. The exhaust has to be dropped for that install, and maybe they missed a hanger or something? or didn't tighten something up?
Also just saw you heard it mainly in 'Park', doubt highly you'd get any knock at idle.
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Joined: Mar 2005
Posts: 93
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From: Apex NC
http://www.pistonslap.com/photos.htm
They have an audio file of what piston slap is. See if this is your noisie.
They have an audio file of what piston slap is. See if this is your noisie.
