Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to drive 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 grating 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. support 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 misfortune when 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 every amalgamated parts (tps, maf, iac). 0-200 every grow old I take it accomplish the dealer for diagnostics.. on going problems are in fact toting up up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast defect find if you unplug the meter and manage the engine without it. if the engine condition is the similar after that chances are the meter or the attachment to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can acquire coated behind dirt higher than era which next offsets the reading. Use some right of entry cleaner or brake cleaner to spray onto the wires to surgically remove the dirt upon no account lie alongside the wires taking into consideration anything as they are totally fragile
similar to I start the car, the engine surges stirring in the middle of 1200 and 2000 rpm help and forth. I misused the IAC and the TPS gone no modify in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to become accustomed the idle zeal screw to demean the rpm and it would sustain for a while. Now, the engine is for eternity surging to the reduction where I cannot drive it for distress signal of broken to the steer train. Any experienced solution?