Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 2-3 every second 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. still had issues. encourage to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble in the manner of this car.. bought a used one.. more trouble. had the indigenous 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon all similar parts (tps, maf, iac). $100-200 every get older I understand it attain the dealer for diagnostics.. on going problems are in point of fact toting up up. I m unsure 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 say you a little more practically the misfortune history. It currently has a master tech approved idle air manage valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would govern in the car without this symptom.
bearing in mind I start the car, the engine surges stirring amongst 1200 and 2000 rpm assist and forth. I misrepresented the IAC and the TPS in imitation of no amend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to get used to the idle readiness screw to belittle the rpm and it would hold for a while. Now, the engine is for eternity surging to the lessening where I cannot drive it for warning of damage to the steer train. Any experienced solution?
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