Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 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. urge on to the dealer.. this get older he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty taking into consideration 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on every joined parts (tps, maf, iac). $100-200 all era I say yes it do the dealer for diagnostics.. upon going problems are essentially tallying up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might then be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a fast idiosyncrasy find if you unplug the meter and run the engine without it. if the engine condition is the thesame after that chances are the meter or the association to it is faulty. Its along with worth cleaning the MAF sensor wires, as they can get coated later dirt higher than get older which next offsets the reading. Use some entre cleaner or brake cleaner to spray can onto the wires to surgically remove the dirt upon no account be next to the wires with anything as they are unquestionably fragile
subsequently I begin the car, the engine surges up surrounded by 1200 and 2000 rpm put up to and forth. I distorted the IAC and the TPS like no fiddle with in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle keenness screw to lower the rpm and it would withhold for a while. Now, the engine is continuously surging to the reduction where I cannot steer it for scare of broken to the drive train. Any experienced solution?
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