Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 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. help to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common burden 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics on all linked parts (tps, maf, iac). $100-200 all time I recognize it pull off the dealer for diagnostics.. on going problems are really adjunct up. I m unsure to be next 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 tell you a little more not quite the suffering history. It currently has a master tech qualified idle let breathe run 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 on switching the car into idle mode correspondingly I'd suggest to make definite the throttle plate is 100% closed and not slightly stranded next carbon. and after that acclimatize the TPS therefore that the IDL attach is continuous to the E2 fasten similar to the throttle is closed, and approach circuit afterward the throttle is just cracked. Don't trouble more or less any voltages, the IDL right to use is the in fact important one.
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