Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to steer off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 oscillate 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. help to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common problem later 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon all partnered parts (tps, maf, iac). $100-200 all time I say you will it get the dealer for diagnostics.. upon going problems are in fact adjunct up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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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 approximately the pain history. It currently has a master tech approved idle expose control valve and tps installed. without upsetting anything, the last (used) ecu and my original, would manage in the car without this symptom.
Hello the TPS does have an effect upon switching the car into idle mode suitably I'd recommend to make certain the throttle dish is 100% closed and not slightly grounded taking into consideration carbon. and then familiarize the TPS fittingly that the IDL attach is continuous to the E2 stick when the throttle is closed, and log on circuit later the throttle is just cracked. Don't badly affect practically any voltages, the IDL way in is the truly important one.
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