Quote:
Originally Posted by Ferdman
Ryan, with a bad ignition control unit (ICU) the engine will not start. Just went through that with our 1991 300CE. Keep in mind that MB dealers sell reconditioned ICU's if you ever need one. Even the reconditioned ICU's are expensive though.
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Fred, that wasn't my experience when my EZL went south. The motor would start, but it acted like the timing was way out of whack and coughed and sputtered like it was hitting on only about half the cylinders.
Ryan, some of your symptoms are familiar to me too. I saw no mention in your earlier posts about replacing IAC (idle control valve) or the throttle micro switch. I replaced both of those and made a significant improvement. Also, your fluctuating idle RPMs suggest a possible vacuum leak. The two shaped rubber vacuum lines coming off the IAC are the usual suspects for leaks.