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  #1  
Old 11-25-2007, 07:51 PM
80300dbenz's Avatar
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Join Date: Mar 2006
Location: Houston
Posts: 125
Knocking noise at start up.

I have a 1990 300SE and experiencing some wierd nosie while starting it up.
The moment the key is turned and the car starts to crank there is a horrible knoking sound comeing from where I think is the center console or passenger floor area. The nosie continues about 5 seconds and then just fades away.
Is there a problem with the drive shaft? Transmission mounts? or something just loose?
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Old 11-25-2007, 08:09 PM
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Join Date: Jul 2002
Location: visalia ca
Posts: 368
if it goes away as soon as the oil pressure built up i would be really concerned. otherwise it might be something hitting underneath due to a bad mount or something. you can take apart the oil filter to see if there is any metal in it but check underneath first.

george
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  #3  
Old 11-27-2007, 06:39 PM
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Join Date: Jun 2007
Posts: 29
check your smog/air pump
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