Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize 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 irritating 2-3 substitute 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. still had issues. put up to to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune past 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics upon all partnered parts (tps, maf, iac). $100-200 every mature I agree to it accomplish the dealer for diagnostics.. upon going problems are essentially extra up. I m hesitant to be next 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 ventilate flow meter and said it was good. taking into consideration I unplug it and run the motor, the car runs coarse and at 850ish. I can forlorn guess that my supplementary rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of all this. I don’t think the tps has that much govern in the swing of rpm though? I think it solitary adjusts it just about 1k..
later than I begin the car, the engine surges occurring surrounded by 1200 and 2000 rpm back and forth. I tainted the IAC and the TPS in imitation of no regulate in symptoms. I have noticed that several Lexus SC’s have this similar issue. Prior to this I would have to familiarize the idle swiftness screw to degrade the rpm and it would retain for a while. Now, the engine is continuously surging to the dwindling where I cannot steer it for unease of broken to the drive train. Any experienced solution?
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