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right. when that blue/red wire gets 12v it should bring the idle up significantly, instantly. Its designed to counteract the load of the compressor turning on.
Sometimes the IACV is old or stuck and the function fails. I would test it. Manually run 12v signal to the iacv with the engine running to verify the idle comes up.
also, whoever wires the harness is responsible for making sure the wire is correctly connected.
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