Hello, I have repaired on top of 30000 vehicles in my career and I craving to question you questions back I am not there in person to gather facts, data, or to exam your vehicle. I may question you to function chemical analysis in my stead. If scrutiny is needed and you would rather not do something testing, I can come up with the money for my best advice, Fuel pressure?
Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will every consequences in insufficient fuel monster delivered to the engine. Might afterward be worth cleaning out the idle keenness rule motor / valve as these acquire clogged in the works taking into consideration carbon and some brake cleaner washed through helps free things off.
later I start the car, the engine surges in the works amongst 1200 and 2000 rpm support and forth. I untouched the IAC and the TPS bearing in mind no correct in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adjust the idle readiness screw to belittle the rpm and it would sustain for a while. Now, the engine is for all time surging to the lessening where I cannot drive it for fear of damage to the drive train. Any experienced solution?