Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to steer 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 trying 2-3 interchange 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. back up to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common problem gone 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics upon every related parts (tps, maf, iac). 0-200 every grow old I recognize it do the dealer for diagnostics.. on going problems are in reality toting up up. I m undecided 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 virtually the misfortune history. It currently has a master tech recognized idle freshen rule valve and tps installed. without upsetting 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 thus I'd recommend to make clear the throttle plate is 100% closed and not slightly ashore following carbon. and after that adjust the TPS suitably that the IDL pin is continuous to the E2 pin when the throttle is closed, and edit circuit taking into account the throttle is just cracked. Don't badly affect about any voltages, the IDL right of entry is the in reality important one.