This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and consequently not compensated for and can thin the engine out and can next permit the engine to rev up later than not desired causing coarse running. As its a mechanical deformity it tends not to point upon the anomaly blithe and you can sometimes hear a hissing noise taking into consideration 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 very nearly the pain history. It currently has a master tech qualified idle freshen govern valve and tps installed. without upsetting anything, the last (used) ecu and my original, would manage in the car without this symptom.
next I begin the car, the engine surges up between 1200 and 2000 rpm encourage and forth. I changed the IAC and the TPS with no tweak in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adjust the idle keenness screw to lower the rpm and it would maintain for a while. Now, the engine is for ever and a day surging to the reduction where I cannot drive it for apprehension of damage to the drive train. Any experienced solution?
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