This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and as a result not compensated for and can thin the engine out and can after that allow the engine to rev taking place like not desired causing rude running. As its a mechanical malformation it tends not to slant on the fault vivacious and you can sometimes hear a hissing noise considering 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 more or less the suffering history. It currently has a master tech recognized idle ventilate control valve and tps installed. without upsetting anything, the last (used) ecu and my original, would control in the car without this symptom.
afterward I start the car, the engine surges happening together with 1200 and 2000 rpm back and forth. I untouched the IAC and the TPS taking into consideration no change in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle eagerness screw to humiliate the rpm and it would withhold for a while. Now, the engine is all the time surging to the dwindling where I cannot steer it for dread of damage to the drive train. Any experienced solution?
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