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Old 07-10-2007, 07:12 PM   #1
Derekleu is on a distinguished road
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1999 SL
Default Clacking sound

Sounds fine in idle, when I speed up, I hear a clacking sound coming from what seems to be the alternator area. I hold my hand to the valve cover and can't seem to attach the sound to any vibration in particular.

When RPM's go up, so does frequency of clacking.

This is all in neutral, with me controlling the throttle at the TB.

Any hints as to where I should go from here?
1999 SL SOHC 138k

Last edited by Derekleu; 07-10-2007 at 07:14 PM. Reason: Added RPM correlation.
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Old 07-11-2007, 12:59 AM   #2
plastic torpedo
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2000 SL2
1994 SC2
Default Re: Clacking sound

Inspect the serpentine belt. Mine was kinda old and the rubber part of it that wraps around the pulleys had a little area where the rubber chipped off and made a sound every time it went over a pulley, so that would be the first thing to check.
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Old 07-11-2007, 06:52 AM   #3
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2000 SW2
1998 SL2
Default Re: Clacking sound

Pull the serpentine belt off and run the car briefly to verify the sound is gone. Turn the pulleys by hand to see if any are binding. To me this sounds like a tensioner problem though.
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