Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize 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) upon tps, iac and maf and cleaned the TB. After irritating 2-3 stand-in 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 get older he says, it needs a ECU. I did a lot of research on them, and found that its a common pain next 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 related parts (tps, maf, iac). $100-200 every era I receive it get the dealer for diagnostics.. on going problems are in fact toting up up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast aberration find if you unplug the meter and govern the engine without it. if the engine condition is the same after that chances are the meter or the relationship to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can get coated once dirt on top of period which next offsets the reading. Use some gate cleaner or brake cleaner to spray can onto the wires to surgically remove the dirt upon no account touch the wires following anything as they are completely fragile
gone I start the car, the engine surges occurring surrounded by 1200 and 2000 rpm back and forth. I misused the IAC and the TPS as soon as no fiddle with in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adjust the idle quickness screw to belittle the rpm and it would preserve for a while. Now, the engine is all the time surging to the reduction where I cannot drive it for warning of broken to the steer train. Any experienced solution?
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