1980 300sd help! - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 08-25-2006, 09:38 PM Thread Starter
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Vehicle: 1982 300sd - Daily Driver 1980 300sd - Project
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Exclamation 1980 300sd help!

I have a 1980 300sd and at idle the engine idles rough. At high speeds, the engine smoothes out and I seem to get more power. My question, could this be fixed by a valve adjustment, or would it be something more serious such as bad injector, or even (heaven forbid) low compression? The car has over 400,000 miles, but exact mileage is unknown. Has anyone had experience with a similar situation, or have any suggestions? Any help is greatly appreciated. Thanks.
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post #2 of 3 (permalink) Old 08-25-2006, 09:46 PM
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Welcome aboard Cyberiian! Mercedes 4 and 5 cylinder diesels of that era definitely benefit from somewhat frequent valve adjustments -- it's certainly worth a try. Bad injector(s)? Who knows, but that's nothing serious either.

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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post #3 of 3 (permalink) Old 08-28-2006, 09:14 PM
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If your dash is like mine (76 300D) you have an idle speed adjusment knob. Try that
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