Acceleration vibration - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 04-23-2006, 09:30 AM Thread Starter
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Acceleration vibration

Hi All,

Recently my 380sl started vibrating on accelleration, kind of like a 'wobbly' feeling when I hit the pedal, regardless of speed, and smooths out around 1500 rpm. My mechanic said that one of the motor mounts is broken (passenger side, I think). Would this be the cause of the new vibration?
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post #2 of 6 (permalink) Old 04-23-2006, 10:46 AM
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I haven't kept track of the things you've done, but subframe mounts/motor mounts are suspect and one of the first places to look if they have never been replaced. It's easy to see collapsed subframe mounts; motor mounts are a lot trickier to diagnose without actually removing anything, although it might be possible to make a measurement of engine height against a car with new mounts, or if you dare, watch the engine while accelerating the engine.

FWIW, at 84K and 18 years, my subframe mounts were shot (one actually disintegrated); my driver's side motor mount was broken and my right side mount was crushed. The car had been driven by "little old ladies" for 15 of the most recent previous 18 years until I bought it.

I and others have reason to suspect that broken motor mounts contribute to the infamous "broken radiator neck" problem, in that the motor jumps around and pulls on the neck via the (very tight) upper radiator hose.

Replacing these parts for the home mechanic is doable, but not easy and considerable safety precautions are involved.

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post #3 of 6 (permalink) Old 04-24-2006, 06:48 PM Thread Starter
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Do you think this is why I'm getting 'wobbly' accelleration to about 1500rpm?
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post #4 of 6 (permalink) Old 04-24-2006, 07:09 PM
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Originally Posted by graybeard
Do you think this is why I'm getting 'wobbly' accelleration to about 1500rpm?
Seems like a good suspect to me.

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post #5 of 6 (permalink) Old 04-24-2006, 07:45 PM Thread Starter
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Well, here's the weird one-- this morning when I started the benz cold, it drove for about 1.5 miles with no 'wobble' at all and only started to misbehave around 2 miles as the engine warmed-up. Any thoughts on this?
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post #6 of 6 (permalink) Old 05-02-2006, 09:25 PM Thread Starter
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Hi All, well a just put in a set of new injectors and seals and badda bing-- she's idling and running fine all the way through the rpm's. Thanks to all for your suggestions and I hope someone will benefit from this thread in the future.
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