Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 2-3 alternating 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. support to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem later 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on every aligned parts (tps, maf, iac). 0-200 every mature I believe it realize the dealer for diagnostics.. on going problems are really calculation up. I m hesitant to be adjacent to 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 approximately the trouble history. It currently has a master tech endorsed idle freshen rule valve and tps installed. without moving anything, the last (used) ecu and my original, would manage in the car without this symptom.
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