P4 ECM #1227748 questions

[Ludis Langens]

Nick McAlpin wrote:
> 
> when i finally come off the highway an hour
> later and come to a complete stop, the ECM still is "stuck" at high
> idle ~2000 rpm.  If I sit at a complete stop, the ECM will step down
> the idle in fairly noticable ~100rpm steps until it reaches 1000rpm.

I think you have a vacuum leak.  The Fiero 2.8 V6 behaves similarly when
it has a leak (ie, a really high cold idle that slowly comes down to
normal, and has to be relearned every time.)

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/

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