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RPM (and lights) drift during 1st couple minutes
Posted by Brian (more from Brian) on Tue, 27 Mar 2007 12:12:55
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Hi.
When I start my car (96 900S NA) these days, the RPM starts at around 2000 and settles around 1100, but kind of BREATHS / THROBS slowly up.... to like 1200, then exhales down to 1000 and the lights dim when it does that, then after 3 seconds back up to 11 or 1200 and the lights get brighter, then exhales back down to 1000 and the lights get dim again.
This happens for about 2 minutes when idle after a cold start (morning to work, and evening home), then something suddenly kind of kicks in (or off) and the engine gets a little quieter and the RPM settles at 1000 dead on from them on.
QUESTION: WHAT THE HECK IS HAPPENING? and immediate folloup question: how can I fix it (if I can... I'm a moderate DIY, not amateur, not pro).
Thanks!
Brian
1996 900s 175,000mi NA
posted by 71.216.200...
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