Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to drive off a cliff. had a idle surge misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 2-3 every other 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. encourage to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common pain like 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics on every combined parts (tps, maf, iac). $100-200 all times I allow it accomplish the dealer for diagnostics.. on going problems are in point of fact additive up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I did re-check them tho. The master tech did extensive tests on the air flow meter and said it was good. later I unplug it and manage the motor, the car runs unfriendly and at 850ish. I can unaccompanied guess that my other rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of every this. I don't think the tps has that much direct in the swap of rpm though? I think it and no-one else adjusts it approximately 1k..
in the same way as I start the car, the engine surges occurring between 1200 and 2000 rpm assist and forth. I misused the IAC and the TPS similar to no correct in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to acclimatize the idle enthusiasm screw to lower the rpm and it would retain for a while. Now, the engine is until the end of time surging to the tapering off where I cannot steer it for radio alarm of broken to the drive train. Any experienced solution?
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