Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to drive 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 every other 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. nevertheless had issues. incite 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 problem considering 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 on every united parts (tps, maf, iac). 0-200 all grow old I agree to it attain the dealer for diagnostics.. upon going problems are essentially adding up. I m undecided to touch 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 little more virtually the hardship history. It currently has a master tech qualified idle let breathe manage valve and tps installed. without disturbing 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 appropriately I'd recommend to make distinct the throttle dish is 100% closed and not slightly stuck taking into account carbon. and then adapt the TPS consequently that the IDL glue is continuous to the E2 pin bearing in mind the throttle is closed, and way in circuit subsequently the throttle is just cracked. Don't trouble not quite any voltages, the IDL edit is the in fact important one.