Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize 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 maddening 2-3 stand-in 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. urge on to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics on every joined parts (tps, maf, iac). 0-200 every period I take on it get the dealer for diagnostics.. on going problems are in point of fact count 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 little more very nearly the hardship history. It currently has a master tech endorsed idle ventilate run valve and tps installed. without distressing anything, the last (used) ecu and my original, would rule in the car without this symptom.
Hello the TPS does have an effect upon switching the car into idle mode fittingly I'd suggest to create clear the throttle plate is 100% closed and not slightly stranded like carbon. and later accustom yourself the TPS hence that the IDL fasten is continuous to the E2 glue as soon as the throttle is closed, and gate circuit following the throttle is just cracked. Don't trouble not quite any voltages, the IDL read is the really important one.