MB 380 SEL 1980 idle problem

When cold the idle to high. When warm the idle to low.
What can be wrong ?
Regards
Heine Holten Denmark

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How high is too high and how low is too low (how many rpms)? Richard

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Cold 15-1800 rpms Warm under 500 rpms and sometimes the energines stops.
Regards
Heine Holten
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This is from memory, so please forgive if it's not exactly accurate .. There's a little valve in front of the air cleaner that controls the idle speed. If you tap on it with the handle of a ratchet or something like that while the engine is running and the speed changes, then you have found your problem. (there is a knob with a slotted head for adjustment on the unit)
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No, that's is one part of it... The majority of cause is the idle control computer... located in between the two firewall... in the middle... that black box.
Reman is around $100 I think.
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i stand corrected! :)
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