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Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 2-3 swing 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. nevertheless had issues. back to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty taking into consideration 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on every partnered parts (tps, maf, iac). 0-200 all epoch I undertake it pull off the dealer for diagnostics.. on going problems are in fact supplement up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a little more practically the misfortune history. It currently has a master tech credited idle expose control valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would rule in the car without this symptom.
This could be a large vacuum leak ,with the MAF connected it is without help measuring the air that is getting with the MAF, suitably if the intake manifold is sucking in freshen the expose to fuel ratio will be unquestionably out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. with carb cleaner spray can vaporizer in the area of the hissing taking into account the engine doling out and subsequently you listen the engine stall or rev far along there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.