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S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

Help with shaking problem

     
Old Mar 29, 2006 | 01:37 PM
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kneegrow
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Help with shaking problem
I have a 1985 500 sel that shakes at idling and shuts down after driven a few miles. I tiik it to a mechanic all he did was change spark plugs, wires, distributor, and fuel filter. I admite the car runs a little better but still shuts down after the engine warms up. can someone help please???
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Old Mar 29, 2006 | 02:41 PM
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From: Indiana
1986 560SEL, 97 BMW 740iL
Dirty fuel lines? Something leaky?
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Old Mar 29, 2006 | 04:52 PM
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as in oil, air, what is it?
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Old Mar 29, 2006 | 05:06 PM
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From: Indiana
1986 560SEL, 97 BMW 740iL
Our cars have a lot of vacumme lines here and there. Also check the mixture to see if it's running too lean.
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Old Mar 30, 2006 | 03:27 AM
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Thanks I will check it out
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Old Apr 21, 2006 | 06:23 PM
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1984 500SEC
get a new mechanic, he obviously did not fix the problem
It could be a multitude of things
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Old May 8, 2006 | 02:57 PM
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2006 E320 CDi, 2008 3/4 Ton Suburban, 2007 "rice rickshaw" Accord 5 speed
shakin' all over
Originally Posted by kneegrow
I have a 1985 500 sel that shakes at idling and shuts down after driven a few miles. I tiik it to a mechanic all he did was change spark plugs, wires, distributor, and fuel filter. I admite the car runs a little better but still shuts down after the engine warms up. can someone help please???
Yes. My 1986 560 SEL had the same problems and the MB dealer did exactly what you had done to your car with no improvement. There was also a terrible smell of burning oil in the cabin whenever the car was not cruising on the highway. After checking under the hood I noticed the old oil filler cap (came with the car) is leaking quite a bit. This was replaced and unexpectedly cured the shaking problem. I discussed this with another mechanic and he feels this "loss of pressure" in the engine or "a loss of vacuum in the engine" was the cause of the shaking.

If your oil filler cap is leaking. Try a new one.
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