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Old 03-04-2003, 11:43 PM
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Join Date: May 2001
Posts: 301
420SEL idle puzzle

1991 420SEL with 195k miles
This car has never had a "silky" smooth idle and recently the miss had become quite noticeable. About 10 days ago I substituted med grade fuel for the premium I have always used and, I'm sure by coincidence, the idle smoothed out like never before. The hicup/stutter step when taking off from a stop even dissapeared Suddenly today it stalled at a traffic light. The car restarted but would not idle, if I kept my foot on the peddle it would stay steady at 600 RPM and when I shifted into drive, I could accelerate but the second I took my foot off the peddle it would stall. This problem went away as soon as it came and now everything "seems" OK.

What's going on??!?
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Old 03-05-2003, 09:39 AM
Posts: n/a
Could be varnish and other crud in your fuel distribution system. For the cost of it - go to Pep Boys and get a bottle of fuel system cleaner and conditioner and put it in the gas tank. As you drive - at first the problems may appear more prevalent as the crud is desolved and improve as the tank is emptied. I find that highway runs helps while the cleaner is in the tank. Just a thought and a lot cheaper than other things to try. I have a 560sel that had idle problems for 2 years. If the above doesn't work - email me and I will list you the things I did to cure my problem. After much hair pulling and thinking that my V8 would never idle silky smooth - I now have success. Don't get me wrong - the idle was fine - just a slight hic every couple of seconds or so - just enough to aggrevate.
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