02 Trailblazer Wiring Diagram

This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and for that reason not compensated for and can lean the engine out and can also permit the engine to rev taking place once not desired causing coarse running. As its a mechanical defect it tends not to point of view upon the irregularity blithe and you can sometimes listen a hissing noise later than the engine running.

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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a tiny more approximately the difficulty history. It currently has a master tech approved idle let breathe manage valve and tps installed. without touching anything, the last (used) ecu and my original, would manage in the car without this symptom.

Hello the TPS does have an effect on switching the car into idle mode as a result I'd recommend to make sure the throttle plate is 100% closed and not slightly stuck once carbon. and later become accustomed the TPS for that reason that the IDL pin is continuous to the E2 glue subsequently the throttle is closed, and right to use circuit taking into consideration the throttle is just cracked. Don't trouble approximately any voltages, the IDL approach is the in reality important one.

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