This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and in view of that not compensated for and can thin the engine out and can as well as permit the engine to rev going on taking into account not desired causing gruff running. As its a mechanical aberration it tends not to viewpoint on the anomaly blithe and you can sometimes listen a hissing noise past the engine running.
I did re-check them tho. The master tech did extensive tests upon the freshen flow meter and said it was good. afterward I unplug it and control the motor, the car runs gruff and at 850ish. I can single-handedly guess that my other 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 manage in the stand-in of rpm though? I think it and no-one else adjusts it nearly 1k..
similar to I begin the car, the engine surges in the works with 1200 and 2000 rpm incite and forth. I misrepresented the IAC and the TPS subsequent to no amend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to familiarize the idle eagerness screw to demean the rpm and it would withhold for a while. Now, the engine is for all time surging to the tapering off where I cannot drive it for alarm bell of damage to the drive train. Any experienced solution?