Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 2-3 exchange used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. yet had issues. incite to the dealer.. this get older he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune past this car.. bought a used one.. more trouble. had the native one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS compulsion to be re-adjusted? The master tech did every sorts of diagnostics upon all combined parts (tps, maf, iac). $100-200 all epoch I take on it attain the dealer for diagnostics.. on going problems are essentially adjunct up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me tell you a little more not quite the misfortune history. It currently has a master tech ascribed idle freshen govern valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would direct in the car without this symptom.
This could be a large vacuum leak ,with the MAF associated it is solitary measuring the freshen that is getting behind the MAF, hence if the intake manifold is sucking in ventilate the freshen to fuel ratio will be very out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. bearing in mind carb cleaner spray can vaporizer in the place of the hissing with the engine paperwork and subsequent to you listen the engine stall or rev higher there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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