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Oops .. and yet more questions!
Posted by phil94028 [Email] (more from phil94028) on Sun, 12 Oct 2008 16:59:28
In Reply to: Re: Thanks .. and 02 sensor, Justin VanAbrahams
[Profile/Gallery]
, Sun, 12 Oct 2008 13:33:21
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I thought I hadn't seen a Saab do high idle before! It must run rich when cold for drivability though right?
What's odd is it's fine after 20 minutes or so then perfect until the next cold start. I'm pretty sure it's not a vacuum leak too by pinching off each hose in turn.
PTC Coolant Sensor and 02 sensor on order and I guess I'll recheck the AIC too.
Drivability is fine hot or cold which pointed me away from the AMM.
I'm more an 8 valve CIS guy though! I guess I could monitor the voltage ou of the O2 sensor and see if its in closed loop mode.
It sure seems to me that the engine control module knows the RPM from the crank sensor and just has to servo that with the (hopefully working) AIC.
I guess if there's a vacuum leak the AIC could be fully closed and the Lambda system will enritch the mixture which would have to cause a higher RPM? I guess I'd better make sure the throttle really is fully closed too!
posted by 75.101....
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