Quote:
Originally Posted by AwdGSX13
lots of reasons, caps can leak and mess it up...
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No, not in the context of what we are talking about, leaking caps will cause:
-Check engine
-bad running -and- bad idle
-"fishy smell"
-physical visual damage to the board.
The damage caused by a bad IAC does not match any of the above criteria.
The only real way to see if you have a bad IAC/IAC board drivers is to take the car out of gear while rolling, RPMs should be about 900-1300. When you come to a stop, the IAC should drop the RPMS down several hundred to about 750RPM.
One of the ECUs I tested worked great and the car idled pretty well, but using this test the car almost died when I let off the gas and applied brakes, and in the best case it would go down to about 700rpm when rolling, which is not correct and dangerous.
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