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I've been having a hell of a time getting my Z to idle correctly. It gradually starting idling higher and higher and now wants to stay at 2000RPM. After MUCH troubleshooting, rebuilding throttle bodies, replacing parts (IACV), doing research, etc., it appears AAC Valve is recieving constant voltage (90%) according to Nistune; rendering the AAC Open, thus introducing more air into the plenum and demanding more fuel from the ECU, correct?. If I uplug the yellow connector to the AAC, or squeeze the hose going to the IACV on the DS, it idles fine. I checked the voltage coming out from the ECU and it's constant 13+ Volts; understand various devices talk to the ECU to turn the AAC off and on. I remember reading the CTS Coolant Temp Sensor, Fuel Temp, 02 Sensors, Throttle Position Sensor and MAFs may play a role but they aren't coding out in NISTUNE and pass all voltage/Ohm test. There are no boost leaks and the vaccum is at ~20Hg. Any thoughts?
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