Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to steer off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 2-3 swap 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 grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty once 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics on every similar parts (tps, maf, iac). 0-200 all mature I understand it accomplish the dealer for diagnostics.. upon going problems are truly extra up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all upshot in insufficient fuel instinctive delivered to the engine. Might moreover be worth cleaning out the idle rapidity manage motor / valve as these acquire clogged in the works in the same way as carbon and some brake cleaner washed through helps forgive things off.
subsequent to I begin the car, the engine surges occurring surrounded by 1200 and 2000 rpm incite and forth. I misused the IAC and the TPS considering no correct in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adjust the idle zeal screw to belittle the rpm and it would withhold for a while. Now, the engine is for all time surging to the lessening where I cannot steer it for siren of damage to the drive train. Any experienced solution?