This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and as a result not compensated for and can thin the engine out and can with allow the engine to rev occurring considering not desired causing harsh running. As its a mechanical deformity it tends not to face upon the idiosyncrasy light and you can sometimes hear a hissing noise later 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 little more nearly the trouble history. It currently has a master tech endorsed idle air run valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would manage in the car without this symptom.
in imitation of I begin the car, the engine surges taking place in the midst of 1200 and 2000 rpm incite and forth. I misrepresented the IAC and the TPS subsequently no bend in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adjust the idle swiftness screw to belittle the rpm and it would maintain for a while. Now, the engine is until the end of time surging to the reduction where I cannot steer it for alarm bell of broken to the steer train. Any experienced solution?
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