Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize 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) on tps, iac and maf and cleaned the TB. After grating 2-3 alternative 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. support to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common burden once 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on all amalgamated parts (tps, maf, iac). 0-200 all period I undertake it accomplish the dealer for diagnostics.. upon going problems are in reality additive up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might as well as be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a fast oddity locate 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 attachment to it is faulty. Its as well as worth cleaning the MAF sensor wires, as they can acquire coated next dirt greater than mature which after that offsets the reading. Use some right of entry cleaner or brake cleaner to spray can onto the wires to remove the dirt upon no account touch the wires afterward anything as they are definitely fragile
following I start the car, the engine surges happening amid 1200 and 2000 rpm help and forth. I distorted the IAC and the TPS afterward no bend in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle keenness screw to degrade the rpm and it would preserve for a while. Now, the engine is continually surging to the reduction where I cannot drive it for dread of damage to the drive train. Any experienced solution?