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Interesting thread. I haven't picked up a wrench in years, but occasionally see what perils others are dealing with. Notwithstanding all the good points raised herein, with regard to vacuum leaks, voltage values and the known problems with idle speed regulators, I should also like to add that in many cases, I frequently saw a worn/mal-adjusted idle switch. This often results in everything else being replaced simply because of the difficulty in accessing the idle switch. At any rate, when I was working on MBZ's with the CIS/IAC systems, I used the BMW-style idle air control valve with frequency adjuster...
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 Did you just pass my 740 at 200 kmh in a 300SD?????
1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013
100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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11-20-2018, 02:13 PM
Threaded Mode
