Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer 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 alternative 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. back up to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty in the manner of this car.. bought a used one.. more trouble. had the indigenous 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on every similar parts (tps, maf, iac). 0-200 all epoch I bow to it get the dealer for diagnostics.. on going problems are in point of fact accumulation up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its along with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all consequences in insufficient fuel inborn delivered to the engine. Might afterward be worth cleaning out the idle rapidity govern motor / valve as these get clogged stirring following carbon and some brake cleaner washed through helps free things off.
I don't have any check engine lights unless I unplug the MAF sensor. later the MAF is plugged in after that the car will stall unless I put my foot on the accelerator. There is also an intermittent popping solid coming at idle.