Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to drive 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 irritating 2-3 swap 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 up to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common problem 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon every linked parts (tps, maf, iac). 0-200 every period I consent it attain the dealer for diagnostics.. on going problems are in fact surcharge up. I m of two minds 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 tiny more not quite the trouble history. It currently has a master tech recognized idle ventilate run 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 upon switching the car into idle mode so I'd recommend to create positive the throttle plate is 100% closed and not slightly stuck subsequent to carbon. and after that adjust the TPS thus that the IDL attach is continuous to the E2 attach like the throttle is closed, and edit circuit afterward the throttle is just cracked. Don't cause problems approximately any voltages, the IDL right of entry is the essentially important one.