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IAC Valve function & testing. 900

posted by  someone claiming to be Happy on  Mon Apr 11 05:27 CST 2005 [RELATED]

960 1993 177K miles. Intermittent rough idle.

Unlike the 740 series, the 960 TPS switch does not have a positive click. I think it acts more like a potentiometer. At what point in the TB butterfly travel does the IAC valve cease to control the car's idle.

I ask because I think I have an intermittent IAC valve, but I don't know the best way to test it. I have cleaned the valve part several times, including dis-assembly and armature cleaning. Both coils measure 13-15 ohms.

The question is, how do I know it is opening the correct amount. Can I apply 12vdc should and should the valve open all the way. With the iginition key turned on (not started)the valve hums. Using a stick I can move and vary the valve opening by about 1/8". When I remove the stick the opening DOES NOT snap back.






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