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Erratic Idle on Cold Start - Idle Air Control? 700 1989

posted by  Bean on  Sat Jan 15 04:14 CST 2005
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last visit: Mon Aug 30 03:53 CST 2010
[RELATED]

My '89 765T has idle problems when it first gets started after sitting for ~8+ hours (overnight or after work). The tach will oscillate from ~500rpm to ~1500rpm over 20-30 seconds until something gets warmed up, on occaision the car will stall if I don't give it a little throttle. After it settles down and I can start driving there is also some slight hesitation for the first 1/2 mile...after warming up the car runs like a champ, no idle problems or hesitation.

Over the 20-30 seconds that the tach is oscillating, the amplitude will slowly work its way down to 750rpm and flatten out.

Idle control valve?
Injector not firing optimally on one cylinder?
Ignition power stage?

All ideas welcome! Thanks.

Bean
--
'80 242GT 93k, '94 945T 139k, '89 765T 68k (new '94 B230FT)






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