Hello, I have repaired exceeding 30000 vehicles in my career and I habit to ask you questions back I am not there in person to gather together facts, data, or to test your vehicle. I may ask you to produce an effect testing in my stead. If laboratory analysis is needed and you would rather not appear in testing, I can pay for my best advice, Fuel pressure?
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a tiny more approximately the misery history. It currently has a master tech attributed idle air rule valve and tps installed. without upsetting anything, the last (used) ecu and my original, would control in the car without this symptom.
with I begin the car, the engine surges occurring amongst 1200 and 2000 rpm encourage and forth. I changed the IAC and the TPS afterward no modify in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adjust the idle promptness screw to demean the rpm and it would support for a while. Now, the engine is permanently surging to the reduction where I cannot steer it for bell of damage to the steer train. Any experienced solution?