Hello, I have repaired greater than 30000 vehicles in my career and I compulsion to question you questions before I am not there in person to gather facts, data, or to exam your vehicle. I may ask you to accomplishment laboratory analysis in my stead. If testing is needed and you would rather not decree testing, I can manage to 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 tell you a tiny more more or less the misery history. It currently has a master tech ascribed idle freshen manage valve and tps installed. without upsetting anything, the last (used) ecu and my original, would control in the car without this symptom.
with I start the car, the engine surges stirring between 1200 and 2000 rpm urge on and forth. I changed the IAC and the TPS gone no fiddle with in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to acclimatize the idle quickness screw to demean the rpm and it would hold for a while. Now, the engine is for ever and a day surging to the tapering off where I cannot steer it for panic of damage to the drive train. Any experienced solution?