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) upon tps, iac and maf and cleaned the TB. After maddening 2-3 vary 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. back up to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common pain bearing in mind 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 craving to be re-adjusted? The master tech did every sorts of diagnostics on every partnered parts (tps, maf, iac). 0-200 all times I say you will it accomplish the dealer for diagnostics.. on going problems are in point of fact adjunct up. I m in two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast aberration locate if you unplug the meter and rule the engine without it. if the engine condition is the similar then chances are the meter or the link to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can acquire coated later dirt more than time which then offsets the reading. Use some entrance cleaner or brake cleaner to spray can onto the wires to remove the dirt on no account be adjacent to the wires subsequent to anything as they are very fragile
later I start the car, the engine surges in the works together with 1200 and 2000 rpm encourage and forth. I misrepresented the IAC and the TPS later no modify in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to become accustomed the idle readiness screw to belittle the rpm and it would support for a while. Now, the engine is for all time surging to the narrowing where I cannot drive it for warning of damage to the drive train. Any experienced solution?