Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 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. nevertheless had issues. back up to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering following 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on all amalgamated parts (tps, maf, iac). 0-200 all epoch I say you will it attain the dealer for diagnostics.. on going problems are really count up. I m in two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might afterward be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a quick malformation find if you unplug the meter and control the engine without it. if the engine condition is the thesame then chances are the meter or the attachment to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can get coated similar to dirt more than become old which next offsets the reading. Use some door cleaner or brake cleaner to vaporizer onto the wires to remove the dirt upon no account be adjacent to the wires with whatever as they are completely fragile
bearing in mind I start the car, the engine surges taking place amid 1200 and 2000 rpm support and forth. I misrepresented the IAC and the TPS as soon as no regulate in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to accustom yourself the idle zeal screw to belittle the rpm and it would support for a while. Now, the engine is constantly surging to the dwindling where I cannot drive it for panic of broken to the drive train. Any experienced solution?