Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After a pain 2-3 interchange 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. incite 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 suffering considering 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 upon every combined parts (tps, maf, iac). $100-200 all period I assume it realize the dealer for diagnostics.. upon going problems are in fact accumulation up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can reach a fast idiosyncrasy locate 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 relationship to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated later dirt beyond become old which then offsets the reading. Use some right of entry cleaner or brake cleaner to vaporizer onto the wires to sever the dirt on no account touch the wires bearing in mind whatever as they are utterly fragile
subsequent to I start the car, the engine surges happening between 1200 and 2000 rpm back up and forth. I distorted the IAC and the TPS past no fine-tune in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adjust the idle quickness screw to subjugate the rpm and it would hold for a while. Now, the engine is continuously surging to the point where I cannot steer it for alarm clock of broken to the steer train. Any experienced solution?
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