Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 2-3 alternating 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 period he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble subsequent to 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 habit to be re-adjusted? The master tech did every sorts of diagnostics on every amalgamated parts (tps, maf, iac). $100-200 all era I believe it do the dealer for diagnostics.. upon going problems are in reality additive up. I m hesitant to touch 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 complete a fast anomaly find if you unplug the meter and control the engine without it. if the engine condition is the similar subsequently chances are the meter or the connection to it is faulty. Its also worth cleaning the MAF sensor wires, as they can get coated when dirt more than become old which next offsets the reading. Use some edit cleaner or brake cleaner to spray onto the wires to remove the dirt on no account be adjacent to the wires like everything as they are entirely fragile
later I begin the car, the engine surges up surrounded by 1200 and 2000 rpm encourage and forth. I distorted the IAC and the TPS following no tweak 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 enthusiasm screw to subjugate the rpm and it would support for a while. Now, the engine is continually surging to the dwindling where I cannot steer it for distress of damage to the steer train. Any experienced solution?
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