Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to drive off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 2-3 rotate 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. back up to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble in imitation of this car.. bought a used one.. more trouble. had the original 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 on every combined parts (tps, maf, iac). $100-200 every era I agree to it pull off the dealer for diagnostics.. on going problems are in reality tally up. I m undecided to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I did re-check them tho. The master tech did extensive tests on the expose flow meter and said it was good. in the same way as I unplug it and govern the motor, the car runs sharp and at 850ish. I can unaccompanied guess that my further rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of all this. I don’t think the tps has that much govern in the substitute of rpm though? I think it isolated adjusts it as regards 1k..
Hello the TPS does have an effect upon switching the car into idle mode in view of that I’d recommend to create determined the throttle plate is 100% closed and not slightly stuck afterward carbon. and after that adapt the TPS in view of that that the IDL fasten is continuous to the E2 glue subsequently the throttle is closed, and approach circuit subsequent to the throttle is just cracked. Don’t upset virtually any voltages, the IDL admission is the in point of fact important one.
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