This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and in view of that not compensated for and can thin the engine out and can as a consequence permit the engine to rev happening in the same way as not desired causing sharp running. As its a mechanical idiosyncrasy it tends not to approach upon the irregularity spacious and you can sometimes listen a hissing noise in the manner of 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 nearly the misery history. It currently has a master tech approved idle air control valve and tps installed. without touching anything, the last (used) ecu and my original, would rule in the car without this symptom.
as soon as I start the car, the engine surges up amid 1200 and 2000 rpm help and forth. I changed the IAC and the TPS following no bend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adjust the idle promptness screw to demean the rpm and it would withhold for a while. Now, the engine is continuously surging to the dwindling where I cannot drive it for startle of broken to the steer train. Any experienced solution?
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