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Old 11-08-2002, 11:50 AM
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downsmith downsmith is offline
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Join Date: Jul 2001
Location: Oklahoma Sooners Alumnus
Posts: 116
Please help at the end of my rope!

First, thanks to everyone who has helped me over the years.

I will make this a short as possible...

'85 500SEL, 250,000 miles. I cannot find the trouble; when I start it cold it idles extrememly rough. I have watched it as it warms up and it seems to go through the warmup process, i.e., idle adjusts as it warms up, etc. When cold, I can adjust the CO screw counter-clockwise (leaner) and it trims out. However, once it reaches operating temperature I have to turn it back clockwise (richer) to trim out.

Technical: New top end 6 months ago, rebuilt Lambda box, rebuilt OZL, Idle control box has proper voltage, idle adjuster checks out, battery voltage to warmup regulator. I have driven myself nuts hunting for vac leaks.

The only thing I am not sure about is I think my oil pressure sender is not working. I do not know if that makes any diff.

Anything else I should check? PLEASE HELP!
R. Downs
1985 500SEL (260,000 miles) SOLD!
1974 280 SOLD!
1994 Volvo 850 Turbo Wagon (Yuppie Ice Sled)

"I know I have a Benz and they know it too." If you start bragging about it or shoving in people's face, you then become a Wally; especially to the girls.
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