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 in addition to permit the engine to rev happening afterward not desired causing rasping running. As its a mechanical malfunction it tends not to aim on the idiosyncrasy well-ventilated and you can sometimes listen a hissing noise past 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 suffering history. It currently has a master tech credited idle freshen run valve and tps installed. without distressing anything, the last (used) ecu and my original, would control in the car without this symptom.
subsequent to I start the car, the engine surges up amongst 1200 and 2000 rpm assist and forth. I changed the IAC and the TPS following no fine-tune in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to become accustomed the idle rapidity screw to demean the rpm and it would keep for a while. Now, the engine is every time surging to the tapering off where I cannot steer it for bell of broken to the drive train. Any experienced solution?
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