Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around 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) on tps, iac and maf and cleaned the TB. After bothersome 2-3 alternative 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. back to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty bearing in mind 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon every aligned parts (tps, maf, iac). $100-200 every times I put up with it realize the dealer for diagnostics.. on going problems are in fact accumulation up. I m in two minds to be adjacent 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 tiny more about the trouble history. It currently has a master tech official idle freshen rule valve and tps installed. without distressing anything, the last (used) ecu and my original, would control in the car without this symptom.
Hello the TPS does have an effect on switching the car into idle mode appropriately I'd suggest to create sure the throttle plate is 100% closed and not slightly ashore with carbon. and later adjust the TPS consequently that the IDL stick is continuous to the E2 attach in the same way as the throttle is closed, and entre circuit taking into consideration the throttle is just cracked. Don't trouble not quite any voltages, the IDL approach is the essentially important one.
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