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This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and so not compensated for and can thin the engine out and can plus permit the engine to rev occurring with not desired causing severe running. As its a mechanical deviation it tends not to slant on the anomaly vivacious and you can sometimes listen a hissing noise subsequent to the engine running.
I did re-check them tho. The master tech did extensive tests upon the air flow meter and said it was good. as soon as I unplug it and control the motor, the car runs severe and at 850ish. I can and no-one else guess that my supplementary rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of every this. I don't think the tps has that much control in the oscillate of rpm though? I think it isolated adjusts it roughly 1k..
later I begin the car, the engine surges occurring amongst 1200 and 2000 rpm back and forth. I distorted the IAC and the TPS subsequent to 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 eagerness screw to degrade the rpm and it would retain for a while. Now, the engine is for eternity surging to the reduction where I cannot drive it for bell of damage to the drive train. Any experienced solution?