Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 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. still had issues. help to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering taking into account this car.. bought a used one.. more trouble. had the original 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon every joined parts (tps, maf, iac). $100-200 all era I assume it accomplish the dealer for diagnostics.. on going problems are truly adding up. I m of two minds 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 tell you a tiny more roughly the burden history. It currently has a master tech recognized idle freshen direct valve and tps installed. without moving anything, the last (used) ecu and my original, would direct in the car without this symptom.
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