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 maddening 2-3 oscillate 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 epoch he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery later 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics upon all united parts (tps, maf, iac). 0-200 all mature I take it reach the dealer for diagnostics.. upon going problems are in point of fact toting up up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might next be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a fast aberration locate if you unplug the meter and govern the engine without it. if the engine condition is the similar later chances are the meter or the attachment to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can acquire coated afterward dirt on top of period which next offsets the reading. Use some log on cleaner or brake cleaner to spray can onto the wires to sever the dirt on no account adjoin the wires afterward whatever as they are unquestionably fragile
taking into consideration I start the car, the engine surges up between 1200 and 2000 rpm back up and forth. I tainted the IAC and the TPS past no regulate in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to acclimatize the idle eagerness screw to humiliate the rpm and it would retain for a while. Now, the engine is continuously surging to the tapering off where I cannot drive it for warning of damage to the steer train. Any experienced solution?