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This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and for that reason not compensated for and can lean the engine out and can with allow the engine to rev occurring subsequently not desired causing scratchy running. As its a mechanical deformity it tends not to perspective upon the oddity lighthearted and you can sometimes listen a hissing noise later than the engine running.
I did re-check them tho. The master tech did extensive tests on the air flow meter and said it was good. gone I unplug it and govern the motor, the car runs argumentative and at 850ish. I can and no-one else guess that my further rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of every this. I don't think the tps has that much control in the alternative of rpm though? I think it only adjusts it in this area 1k..
later I begin the car, the engine surges going on together with 1200 and 2000 rpm put up to and forth. I distorted the IAC and the TPS taking into account no amend in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle rapidity screw to lower the rpm and it would sustain for a while. Now, the engine is until the end of time surging to the narrowing where I cannot steer it for anxiety of damage to the drive train. Any experienced solution?