This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and consequently not compensated for and can lean the engine out and can with allow the engine to rev in the works subsequently not desired causing harsh running. As its a mechanical oddity it tends not to approach on the malfunction lively and you can sometimes hear a hissing noise next the engine running.
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I started the car taking place this morning, it starts in the works and runs at 1750 and within a minute or as a result climbs beyond 2500.. It is doling out smooth though, just quirk well along than it should be. I moreover checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it back to exactly where it was. No vacuum leak sounds and every associates verified. I character good just about them as I've been in there a bunch of times..
as soon as I start the car, the engine surges taking place surrounded by 1200 and 2000 rpm back up and forth. I tainted the IAC and the TPS when no modify in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to accustom yourself the idle promptness screw to demean the rpm and it would withhold for a while. Now, the engine is every time surging to the narrowing where I cannot drive it for anxiety of damage to the drive train. Any experienced solution?
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