Check the hose clips for tightness and examine the trunking for any cracks or splits and next all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best exaggeration to find a leak is to have the engine paperwork and hot and after that spray can lighter gas /propane or brake cleaner roughly each joint in turn. If the engine rev s in the works you ve found your leak.
Thanks for your response. I just checked what you mentioned, that I hadn’t already checked, except fuel pressure.Let me tell you a tiny more not quite the trouble history. It currently has a master tech ascribed idle expose rule valve and tps installed. without distressing anything, the last (used) ecu and my original, would run in the car without this symptom.
as soon as I begin the car, the engine surges happening amongst 1200 and 2000 rpm put up to and forth. I tainted the IAC and the TPS past no alter in symptoms. I have noticed that several Lexus SC’s have this same issue. Prior to this I would have to acclimatize the idle eagerness screw to demean the rpm and it would withhold for a while. Now, the engine is constantly surging to the point where I cannot drive it for bell of damage to the drive train. Any experienced solution?
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