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Originally Posted by BCMedic
The Idle Air Control Valve is mounted on the throttle body and regulates the amount of air that bypasses the throttle plate. It receives it's signal voltage from the PCM depending on the PCM's input sensors to control idle speed.
From my 95-2003 manual the first thing to determine is if it's getting a signal. With key in Run position, probe the harness side connector of the IACV's plug. Voltage should be 10.5-12.5 volts if it's receiving a good signal from the PCM. If so check the resistance across the IACV's terminals itself. This should be 6-13 ohms, otherwise replace it.
Also check for an internal short by measuring the resistance between each terminal and the IACV body, it should be 10,000 ohms or more. If it's less then there is an internal short and it needs replacing.
If all this passes, then remove the IACV to check and clean the internal pintle and ports and to allow free movement. After cleaning and with IACV removed, reconnect plug and turn key on and off, (Do Not Start) pintle should freely move. Install with a new o-ring lightly lubed with clean oil.
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Thanks for the info. I need to learn more about the PCM. I think some of my pages are mssing from my manual. What does the PCM do? Is it like a ECM? I replaced one of those once on a '85 or '86 cutlass. Have been reading a lot of info on TSB 3-16-01(isolator bolts). Could these be creating the systems were having. Van really seems to be running ok while driving. Just wants to die out when almost to a complete stop or at a stop when it should be idling. Thanks in advance for any help. This forum is great.