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Re: AIC valve & Ohms meter
Posted by JohnK (more from JohnK) on Wed, 22 Sep 2004 06:57:14
In Reply to: Re: AIC valve & Ohms meter, Saab900man, Wed, 22 Sep 2004 04:15:05
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When the engine is running, you should not be measuring the resistance, but rather the voltage or perhaps the dwell. I don't have a manual in front of me and am not sure if the Bentley manual even has the specs, but ohms are read only when engine is off.
Why don't you try clamping off one of the AIC hoses with a vice grip. If the idle now settles down, your AIC may stuck wide open and you might have found the high idle problem. Additionally, the AIC might be getting the wrong signal from the ECU.
I'm assuming that the temp sensor resistance was OK, i.e. around 300 ohms when engine is warmed up. If so, I would check the fuel pressure regulator by pulling the hose off the intake and looking for gas dripping. If no gas, suck on the hose to make sure the FPR is holding vacuum(spit out gas or use a mityvac to supply the vacuum if you're nervous about getting gas in your mouth).
If FPR is OK, I would then go to the ECU itself behind the passenger side kick panel. there are several troubleshooting procedures in the manual for the ECU and the relays located above the ECU, but the easiest thing to do is borrow an ECU and pop it in.
I would also double check for vacuum leaks downstream from the throttle butterfly. Get a propane torch and with the engine idling direct propane at all hoses, grommets, intake manifold gasket, and injectors. If the idle speed increases, you've found a leak.
posted by 208.208.152...
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