This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and for that reason not compensated for and can thin the engine out and can with allow the engine to rev in the works as soon as not desired causing harsh running. As its a mechanical malfunction it tends not to direction upon the idiosyncrasy blithe and you can sometimes hear a hissing noise in the same way as the engine running.
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I did re-check them tho. The master tech did extensive tests upon the ventilate flow meter and said it was good. bearing in mind I unplug it and control the motor, the car runs coarse and at 850ish. I can on your own guess that my extra 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 direct in the substitute of rpm though? I think it deserted adjusts it with reference to 1k..
when I start the car, the engine surges going on with 1200 and 2000 rpm urge on and forth. I misused the IAC and the TPS when no correct in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adjust the idle enthusiasm screw to demean the rpm and it would retain for a while. Now, the engine is every time surging to the reduction where I cannot drive it for frighten of damage to the drive train. Any experienced solution?
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