1986 300e idle running high but becomes okay when.. - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 10-28-2009, 01:11 PM Thread Starter
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1986 300e idle running high but becomes okay when..

My 1986 300e idle is running high (around 1500 or more) but becomes okay when the car gets hot - I mean physically hot from the sun. We haven't had it very long and haven't driven it long enough to get it really hot engine-wise, so don't know about that for sure, though I think the idle does get slower after a while of driving. Any thoughts? Help---
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post #2 of 2 (permalink) Old 10-28-2009, 01:55 PM
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Date registered: May 2005
Vehicle: '07 GL320CDI
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When engine is cold, idle control valve indeed increases idle. This is necessary to keep ANY engine running when cold. When computer senses engine warming, valve is closed to enable normal idle. It's everything to due with coolant temperature and NOTHING to do with the temperature of the engine hood.

Kent Christensen
'07 GL320CDI
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