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Re: Very high idle, '93 900s
Posted by Dean (more from Dean) on Mon, 18 Mar 2002 11:26:55
In Reply to: Very high idle, '93 900s, Ketil Danielsen, Mon, 18 Mar 2002 09:31:20
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if the ECU is powering the IAC valve to do this that is one situation.
if not:
then the ECU will be trying to close the IAC to the limits if the abilty to do this.
while it is doing this, pinch the downstream side if the IAC's hose shut. How? you figger that out...
With the hose pinched shut, if the engine is still running fast, then it is getting air somehow! Throttle sticking? Manipulate it and oil the shafts if needed. Clean the throttle bore while you are in there. Some mild solvent on a cloth will do the job. You now know to look for an air leak or loose throttle body mounting to the manifold. Manifold loose at the head? If so, what is the manfold stay doing underneath the manifold.
If the throttle position sensor is bad or has wiring problems, the ECU might be energizing tie IAC valve. I would hesitate to remove the IAC connetor on a running engine... concern for damage to the ECU. You can check the resistance and response smoothness of the postion sensor. Eliminate leaks as an issue first.
If pinching the hose off causes lower engine speeds or a stall, then the AIC valve was passing the air. Thus the high speeds are not the result of a grosse air leak.
posted by 208.24.17...
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