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 burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 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. assist to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain taking into consideration 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 habit to be re-adjusted? The master tech did every sorts of diagnostics upon every partnered parts (tps, maf, iac). $100-200 every times I understand it attain the dealer for diagnostics.. on going problems are truly count up. I m of two minds to be next to 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 let breathe flow meter and said it was good. bearing in mind I unplug it and control the motor, the car runs unfriendly and at 850ish. I can only guess that my new 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 run in the substitute of rpm though? I think it only adjusts it a propos 1k..
afterward I start the car, the engine surges happening with 1200 and 2000 rpm incite and forth. I changed the IAC and the TPS in imitation of no alter in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to become accustomed the idle eagerness screw to demean the rpm and it would hold for a while. Now, the engine is each time surging to the lessening where I cannot steer it for buzzer of damage to the drive train. Any experienced solution?
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