Hello, I have repaired on top of 30000 vehicles in my career and I obsession to ask you questions previously I am not there in person to store up facts, data, or to exam your vehicle. I may ask you to pretense laboratory analysis in my stead. If scrutiny is needed and you would rather not undertaking testing, I can offer my best advice, Fuel pressure?
Its next worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will every upshot in insufficient fuel instinctive delivered to the engine. Might afterward be worth cleaning out the idle keenness control motor / valve as these acquire clogged in the works in the same way as carbon and some brake cleaner washed through helps clear things off.
with I begin the car, the engine surges stirring amongst 1200 and 2000 rpm urge on and forth. I untouched the IAC and the TPS when no modify in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle readiness screw to belittle the rpm and it would hold for a while. Now, the engine is continually surging to the narrowing where I cannot steer it for bell of damage to the drive train. Any experienced solution?