Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 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. yet had issues. back up to the dealer.. this mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble in the same way as 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics on every partnered parts (tps, maf, iac). $100-200 all grow old I agree to it get the dealer for diagnostics.. on going problems are truly adding together up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a fast 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 relationship to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can acquire coated like dirt greater than get older which after that offsets the reading. Use some admittance cleaner or brake cleaner to vaporizer onto the wires to sever the dirt upon no account be next to the wires when whatever as they are extremely fragile
later I begin the car, the engine surges up amid 1200 and 2000 rpm put up to and forth. I misused the IAC and the TPS behind no bend 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 quickness screw to demean the rpm and it would withhold for a while. Now, the engine is for ever and a day surging to the narrowing where I cannot steer it for distress signal of damage to the drive train. Any experienced solution?
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