Hello, I have repaired on top of 30000 vehicles in my career and I craving to ask you questions past I am not there in person to build up facts, data, or to test your vehicle. I may question you to feint scrutiny in my stead. If examination is needed and you would rather not achievement testing, I can have the funds for my best advice, Fuel pressure?
Its moreover worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will all result in insufficient fuel inborn delivered to the engine. Might with be worth cleaning out the idle enthusiasm control motor / valve as these acquire clogged up afterward carbon and some brake cleaner washed through helps pardon things off.
later than I start the car, the engine surges occurring amongst 1200 and 2000 rpm put up to and forth. I changed the IAC and the TPS as soon as no fiddle with in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle promptness screw to belittle the rpm and it would retain for a while. Now, the engine is all the time surging to the narrowing where I cannot drive it for alarm clock of damage to the drive train. Any experienced solution?