This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and therefore not compensated for and can thin the engine out and can afterward permit the engine to rev taking place once not desired causing gruff running. As its a mechanical malfunction it tends not to outlook on the deformity light and you can sometimes listen a hissing noise bearing in mind 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 tell you a little more just about the trouble history. It currently has a master tech qualified idle let breathe control valve and tps installed. without upsetting anything, the last (used) ecu and my original, would manage in the car without this symptom.
following I begin the car, the engine surges going on in the midst of 1200 and 2000 rpm encourage and forth. I distorted the IAC and the TPS taking into account no regulate in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to familiarize the idle zeal screw to lower the rpm and it would support for a while. Now, the engine is until the end of time surging to the reduction where I cannot steer it for buzzer of damage to the steer train. Any experienced solution?
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