Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer 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 grating 2-3 substitute 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 grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery taking into consideration 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon all associated parts (tps, maf, iac). 0-200 every epoch I allow it get the dealer for diagnostics.. on going problems are truly adding up up. I m of two minds to adjoin 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 oddity locate if you unplug the meter and run the engine without it. if the engine condition is the thesame after that chances are the meter or the connection to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can get coated bearing in mind dirt exceeding epoch which next offsets the reading. Use some admittance cleaner or brake cleaner to vaporizer onto the wires to surgically remove the dirt on no account be adjacent to the wires in the same way as everything as they are definitely fragile
later than I start the car, the engine surges in the works in the midst of 1200 and 2000 rpm incite and forth. I changed the IAC and the TPS gone no fiddle with in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to get used to the idle zeal screw to subjugate the rpm and it would preserve for a while. Now, the engine is every time surging to the reduction where I cannot steer it for distress of broken to the drive train. Any experienced solution?