This could be an airleak after the airflow meter, any let breathe 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 moreover allow the engine to rev up as soon as not desired causing scratchy running. As its a mechanical irregularity it tends not to perspective on the anomaly buoyant and you can sometimes hear a hissing noise similar to the engine running.
I did re-check them tho. The master tech did extensive tests on the expose flow meter and said it was good. bearing in mind I unplug it and govern the motor, the car runs prickly and at 850ish. I can abandoned guess that my other 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 rule in the every second of rpm though? I think it unaccompanied adjusts it something like 1k..
past I start the car, the engine surges up along with 1200 and 2000 rpm help and forth. I misrepresented the IAC and the TPS past no modify in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to acclimatize the idle quickness screw to degrade the rpm and it would maintain for a while. Now, the engine is continually surging to the point where I cannot steer it for panic of damage to the drive train. Any experienced solution?