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 misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 2-3 different 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. help 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 suffering past this car.. bought a used one.. more trouble. had the indigenous 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 every sorts of diagnostics upon all connected parts (tps, maf, iac). $100-200 all become old I put up with it pull off the dealer for diagnostics.. upon going problems are in point of fact count up. I m undecided to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a quick fault locate if you unplug the meter and direct the engine without it. if the engine condition is the similar then chances are the meter or the link to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can get coated similar to dirt higher than era which then offsets the reading. Use some edit cleaner or brake cleaner to spray onto the wires to separate the dirt upon no account be adjacent to the wires similar to whatever as they are very fragile
when I start the car, the engine surges occurring between 1200 and 2000 rpm put up to and forth. I misrepresented the IAC and the TPS past no modify in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to accustom yourself the idle zeal screw to degrade the rpm and it would keep for a while. Now, the engine is each time surging to the tapering off where I cannot steer it for unease of damage to the drive train. Any experienced solution?
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