Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After frustrating 2-3 swing 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. back 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 difficulty taking into consideration 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon all related parts (tps, maf, iac). 0-200 every grow old I agree to it accomplish the dealer for diagnostics.. on going problems are essentially accumulation up. I m in two minds 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 upon the ventilate flow meter and said it was good. with I unplug it and govern the motor, the car runs brusque and at 850ish. I can unaided guess that my supplementary 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 manage in the every second of rpm though? I think it solitary adjusts it concerning 1k..
subsequent to I start the car, the engine surges taking place in the middle of 1200 and 2000 rpm urge on and forth. I distorted the IAC and the TPS bearing in mind no regulate in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to acclimatize the idle speed screw to belittle the rpm and it would retain for a while. Now, the engine is permanently surging to the narrowing where I cannot steer it for terror of damage to the steer train. Any experienced solution?