BenzWorld Junior Member
Date registered: Sep 2010
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280SEL 4,5 1972 runs poorly at idle speed
Hey. I have a 280 SEL with the M 117.984 engine. The engine starts fine cold and warm. But it goes poor and vibrate at idle speed, especially in gear, waiting for green light etc. Oil pressure is 45 PSI when cold, but about 15 PSI (ca 1,03 bar) when warm. When it was in gear, the oil pressure have been as low as 7-8 PSI. Is this normal? What is normal pressure?
When i accelerate, it rises to 45 PSI quite fast. And the car accelerate well. But it jerks a bit when throttle.
My mechanic said the throttle switch doesnt respond to the diagnosis aparate. There was also false air at 3 of the cylinders. The engine didnt respond when screwing at the CO. But I have now renewed intake manifold gasket, and the 8 rubber in the manifold. and also the smallest rubber part in the tip of the nozzle. So I think it should be no false air, but havend checked that. The car still goes poor it idles speed.
Last edited by 280SEL4,5; 09-27-2010 at 01:39 PM.