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Old 07-09-2002, 01:44 PM
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Join Date: Jul 2002
Posts: 197
vibrating or thumping noise when accellerating

I have an 89 300 SE and the transmission shifts very smoothly, but when you pull out from a dead stop, the car makes a noise like a vibration or thumping that only lasts for a few seconds and generally you do not hear it again. Occassionally, you can hear this same type noise when you hit a bump in the road. I believe the shocks have been replaced shortly before I purchased the car. Could it be the shocks or something loose? Or, could it be a beginning of a problem with the transmission? Also, does anyone know where I can get a service manual such as a Mercedes shop manual or a haynes/chiltons?

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Old 07-09-2002, 04:37 PM
G-Benz's Avatar
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
Sounds like a broken motor mount to me... is where I got my Haynes manual for my W124...I don't remember the link a web search.
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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Old 07-09-2002, 04:47 PM
csnow's Avatar
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Join Date: May 2002
Location: Mass
Posts: 1,127
Perhaps a rubber driveshaft 'flex disk'. There are 2 of these on the driveline. About $60 each for the part. They look like this:

1986 300E 5-Speed 240k mi.
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Old 07-09-2002, 05:31 PM
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Join Date: Jan 2001
Posts: 78
When 6 cylinder gas 126 car motor mounts collapse, the exhaust pipe hits the bolt in support connecting to the front suspension thrust mount brackets to each other. You probably need engine mounts. Don't forget to check the transmission mount, too. If you get under the car, you will see where the metal support has been hitting the exhaust.

Scott P.
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