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is the IAC the ONLY source of air at idle? 200 1989

posted by  interstition on  Sat Sep 3 07:05 CST 2005
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last visit: Mon Apr 28 10:13 CST 2014
[RELATED]

I'm trying to diagnose a slow start - stall when starting from lights condition. After checking just about everything else, I started over with the IAC which appears to be functioning normally. But for no particular reason I plugged the intake of the IAC with my finger when the car was idling and was very surprised that it kept on running at a low idle (about 400 RPM). I searched (again) for a vacuum leak and found nothing, so I tried plugging the main intake to the throttle body and the car died immediately.

That tells me that enough air is getting past the throttle to allow the car to run. Has anyone else tried this? Should I be looking for another throttle body because the spring on mine is weak or something? I just had the TB off and it is quite clean and the throttle appears to close tightly, at least when the engine isn't "pulling" on it.
--
Andy in St. Paul. '89 244 153K mi, '91 745 Regina 202K, '88 244 184K






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