This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and hence not compensated for and can thin the engine out and can furthermore permit the engine to rev up bearing in mind not desired causing brusque running. As its a mechanical deviation it tends not to perspective on the defect well-ventilated and you can sometimes listen a hissing noise in the manner of 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. later I unplug it and govern the motor, the car runs rasping and at 850ish. I can solitary guess that my supplementary rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of all this. I don't think the tps has that much manage in the substitute of rpm though? I think it solitary adjusts it re 1k..
taking into consideration I start the car, the engine surges stirring between 1200 and 2000 rpm incite and forth. I tainted the IAC and the TPS past no bend in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to get used to the idle rapidity screw to demean the rpm and it would support for a while. Now, the engine is forever surging to the lessening where I cannot drive it for frighten of damage to the steer train. Any experienced solution?