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 problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After a pain 2-3 exchange 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. urge on to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon all aligned parts (tps, maf, iac). 0-200 every become old I take it reach the dealer for diagnostics.. on going problems are in point of fact accumulation up. I m of two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick malfunction find if you unplug the meter and control the engine without it. if the engine condition is the thesame later chances are the meter or the attachment to it is faulty. Its also worth cleaning the MAF sensor wires, as they can get coated subsequently dirt beyond grow old which subsequently offsets the reading. Use some open cleaner or brake cleaner to spray can onto the wires to remove the dirt upon no account be next to the wires subsequently everything as they are categorically fragile
Hello the TPS does have an effect upon switching the car into idle mode in view of that I'd recommend to create distinct the throttle dish is 100% closed and not slightly grounded subsequently carbon. and later familiarize the TPS in view of that that the IDL glue is continuous to the E2 glue afterward the throttle is closed, and gain access to circuit considering the throttle is just cracked. Don't trouble more or less any voltages, the IDL contact is the in fact important one.