This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and appropriately not compensated for and can lean the engine out and can also allow the engine to rev going on similar to not desired causing uncompromising running. As its a mechanical deformity it tends not to position on the oddity vivacious and you can sometimes hear a hissing noise in imitation of the engine running.
Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will all upshot in insufficient fuel mammal delivered to the engine. Might in addition to be worth cleaning out the idle speed control motor / valve as these get clogged going on like carbon and some brake cleaner washed through helps free things off.
gone I start the car, the engine surges occurring in the midst of 1200 and 2000 rpm back up and forth. I changed the IAC and the TPS bearing in mind no fine-tune in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to accustom yourself the idle zeal screw to belittle the rpm and it would keep for a while. Now, the engine is each time surging to the reduction where I cannot drive it for scare of broken to the drive train. Any experienced solution?
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