This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and correspondingly not compensated for and can thin the engine out and can also permit the engine to rev up past not desired causing aggressive running. As its a mechanical idiosyncrasy it tends not to aim upon the oddity lighthearted and you can sometimes listen a hissing noise later than the engine running.
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 just about the misery history. It currently has a master tech endorsed idle expose run valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would govern in the car without this symptom.
later than I start the car, the engine surges happening amongst 1200 and 2000 rpm assist and forth. I misrepresented the IAC and the TPS once no tweak in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to become accustomed the idle promptness screw to humiliate the rpm and it would retain for a while. Now, the engine is for ever and a day surging to the point where I cannot steer it for buzzer of damage to the drive train. Any experienced solution?
Image Schematics for auto starter wiring diagram
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