Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around 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 aggravating 2-3 every second 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. help to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common misery in imitation of this car.. bought a used one.. more trouble. had the original 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 habit to be re-adjusted? The master tech did every sorts of diagnostics upon all united parts (tps, maf, iac). 0-200 all era I admit it accomplish the dealer for diagnostics.. upon going problems are in reality calculation up. I m in two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might in addition to be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can reach a quick deformity find if you unplug the meter and direct the engine without it. if the engine condition is the similar subsequently chances are the meter or the relationship to it is faulty. Its with worth cleaning the MAF sensor wires, as they can acquire coated gone dirt on top of grow old which then offsets the reading. Use some way in cleaner or brake cleaner to spray onto the wires to cut off the dirt upon no account adjoin the wires behind whatever as they are very fragile
taking into account I begin the car, the engine surges happening in the midst of 1200 and 2000 rpm put up to and forth. I distorted the IAC and the TPS later than no fine-tune in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to familiarize the idle swiftness screw to belittle the rpm and it would withhold for a while. Now, the engine is permanently surging to the reduction where I cannot steer it for alarm bell of broken to the drive train. Any experienced solution?