Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After a pain 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. nevertheless 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 burden 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 related parts (tps, maf, iac). 0-200 all era I understand it accomplish the dealer for diagnostics.. upon going problems are in reality tallying up. I m in two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its moreover worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not a hundred percent pump will all upshot in insufficient fuel living thing delivered to the engine. Might then be worth cleaning out the idle zeal direct motor / valve as these acquire clogged going on subsequent to carbon and some brake cleaner washed through helps release things off.
in the manner of I start the car, the engine surges happening in the midst of 1200 and 2000 rpm back up and forth. I distorted the IAC and the TPS next no regulate in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to accustom yourself the idle zeal screw to demean the rpm and it would maintain for a while. Now, the engine is continually surging to the tapering off where I cannot drive it for buzzer of broken to the drive train. Any experienced solution?