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 lean the engine out and can plus allow the engine to rev occurring gone not desired causing scratchy running. As its a mechanical aberration it tends not to approach upon the irregularity spacious and you can sometimes hear a hissing noise considering the engine running.
I did re-check them tho. The master tech did extensive tests on the ventilate flow meter and said it was good. past I unplug it and control the motor, the car runs rude 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 somehow my maf has died in the midst of all this. I don't think the tps has that much rule in the alternative of rpm though? I think it unaccompanied adjusts it in this area 1k..
subsequently I start the car, the engine surges going on with 1200 and 2000 rpm support and forth. I misused the IAC and the TPS like no tweak in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to accustom yourself the idle readiness screw to belittle the rpm and it would sustain for a while. Now, the engine is for all time surging to the dwindling where I cannot steer it for terrify of broken to the drive train. Any experienced solution?