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80300dbenz 11-25-2007 07:51 PM

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?

mbshop 11-25-2007 08:09 PM

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.


Lead 11-27-2007 06:39 PM

check your smog/air pump

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