Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to drive off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 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. support to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune next this car.. bought a used one.. more trouble. had the indigenous 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on every joined parts (tps, maf, iac). 0-200 all mature I take on it accomplish the dealer for diagnostics.. on going problems are in point of fact add-on 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 approximately the pain history. It currently has a master tech approved idle let breathe govern valve and tps installed. without disturbing anything, the last (used) ecu and my original, would direct in the car without this symptom.
Hello the TPS does have an effect upon switching the car into idle mode correspondingly I'd suggest to make sure the throttle dish is 100% closed and not slightly high and dry in imitation of carbon. and later adjust the TPS correspondingly that the IDL attach is continuous to the E2 glue bearing in mind the throttle is closed, and gain access to circuit taking into consideration the throttle is just cracked. Don't distress just about any voltages, the IDL get into is the really important one.