1985 190D Rough Idle Problem - Mercedes-Benz Forum

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Old 11-11-2009, 08:24 PM   #1 (permalink)
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Date registered: Dec 2006
Location: So. Cal.
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1985 190D Rough Idle Problem

I have been having an idling problem with my 190D lately. I have had to raise the idle to about 1,000 RPM in order to smooth it out. I have tested a few things to find out the problem. I replaced the 4 injectors with known good ones, no change. I loosened one injector line at a time when idling, and the engine stumbled with each one (telling me there is no dead cylinder). The engine seems to have the same power as before (not much), but just does not idle smooth. Does anyone have any ideas? Any help would be appreciated. Thanks, Rich
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