Help ! My 1985 300TD 's idle is usually rock solid at 750 rpm. I noticed tonight that it is hovering around 1000 rpm. If it sits a minute or so will finally drop to about 800 or so rpm. I know how to adjust the idle but am concerned what I should look at that caused it to shift. The only thing I have done recently is change from 15W-40 rotella to 5W-40 synthetic rotella oil. I don't see how that could have done anything. Current mileage is 213000 miles. Any thoughts ?

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David McDonald
1981 240D
1985 300D (wrecked)
1985 300TD 365,000 miles
1969 Mustang Fastback

If it helps I switched from rotella 15w 40 to the 5w 40 synthetic with no change in idle speed. HTH. Gregg

You could perhaps check the fast idle cable, it has a plastic thingy on the end where it attaches to the throttle lever, perhaps you disturbed it and it is cocked?

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Ed
1981 300CD (Benzina)
1968 250 S (Gina) 266,000 miles!
1983 Alfa Romeo GTV6 (Guido)
1976 Jaguar XJS-saved a V-12 from the chevy curse, what a great engine!
1988 Cadillac Eldorado (better car than you might think!)
1988 Yamaha Venture (better than a Wing!)
1977 Suzuki GS750B
1976 Yamaha XS 650 (sold)
1991 Suzuki GSX1100G (Shafty Gixser)
1981 Yamaha VX920RH (Euro "Virago")
Solex Moped
1975 Dodge P/U camper


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