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jonnyblaze
06-30-2002, 09:22 PM
my 89sc just started to idle real high i was thinking it might be a bad idle air control valve does any one knows how to test it and how much do these parts cost. thanks

TbirdSCFan
06-30-2002, 11:53 PM
Most likely it is the IAC. You could try unplugging it and then start the engine to see if it makes a difference. The other way to test it is to remove it and see if you can blow air through it. No air should pass through.
If you decide you need to replace it, most aftermarket (Borg Warner) won't work because you have to mount them backwards 180 degrees. [I kid you not] Due to the placement of the oil filler tube, it can't be done on the SC. You will need the motorcraft part from Ford, or a type which has the valve closed when its not hooked up.

Digitalchaos
07-01-2002, 04:14 AM
If the IAC is going bad, it should make a very loud howling noise immediatly after shutting the engine down. Does this ever happen?