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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 thin the engine out and can furthermore allow the engine to rev up afterward not desired causing harsh running. As its a mechanical fault it tends not to position upon the irregularity vivacious and you can sometimes hear a hissing noise gone the engine running.
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me tell you a tiny more just about the difficulty history. It currently has a master tech certified idle let breathe rule valve and tps installed. without upsetting anything, the last (used) ecu and my original, would rule in the car without this symptom.
like I begin the car, the engine surges happening in the company of 1200 and 2000 rpm support and forth. I misrepresented the IAC and the TPS bearing in mind no correct in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to become accustomed the idle rapidity screw to lower the rpm and it would support for a while. Now, the engine is permanently surging to the reduction where I cannot drive it for terror of damage to the steer train. Any experienced solution?