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Yes, but...

posted by  BobbyC on  Tue Nov 26 10:18 CST 2002
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last visit: Tue Oct 29 08:31 CST 2013
[RELATED]

only with lete model fuel injected cars with sophisticated computer systems (Motronic systems newer then 1.1). Carburated cars and early fuel injected cars needed higher cold idle speeds to mask less than perfect fuel mixture metering and fuel vaporization in cold manifolds and engines.

All electronically fuel injected cars that use an idle speed valve (pulsed or continuous injection) are temperature vs. idle RPM mapped, regardless if they incorporate elevated cold idle or not.

The better the correlation between engine fuel requirements and the ability of the computer to match these requirements, the less the need for the higher idle speed to compensate for a mismatch.

I know the Motronic 4.4 on my '96 960 springs to life with a momentary RPM of 1100, then immediately settles to a flawlessly smooth 750rpm or so whether stone cold or hot.

Bob






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