Quote:
Originally Posted by funola
The plastic knob has already broken off when I bought my 83 240D. Per the tach I recently installed, it is idling at 700 rpm from a cold start. Turning the broken knob with pliers does not change the idle. It seems to idle fine but it is still warm (50 to 60F has been the coldest) but it will get much colder in the teens. What is the purpose of the idle speed knob? Is it necessary? Should I try to fix it? Is it a PITA to fix?
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That knob is handy especially on my tired (270000mile ) 240D. The one on my 1978 300D is broken and I plan to fix it in the near future. From what I've read (can't find the link but I'll post when I do), you need to push the instrument cluster out and it should be accessible. Take off the lower dash panel and push the cluster from behind. Don't kink/break the oil pressure line or you'll have a mess. Some say you have to unscrew the speedometer cable before doing this. The linkage at the knob is where the problem lies and sounds like an easy fix once you get there. Let us know what happens.
Kevin
1979 240D manual
1978 300D auto