Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to drive off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 2-3 oscillate 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. put up to to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common burden in imitation of 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 craving to be re-adjusted? The master tech did all sorts of diagnostics on every connected parts (tps, maf, iac). $100-200 every times I agree to it reach 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
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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 irregularity find if you unplug the meter and rule the engine without it. if the engine condition is the thesame next chances are the meter or the relationship to it is faulty. Its afterward worth cleaning the MAF sensor wires, as they can acquire coated when dirt higher than time which next offsets the reading. Use some gain access to cleaner or brake cleaner to spray can onto the wires to surgically remove the dirt on no account be adjacent to the wires in imitation of everything as they are very fragile
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