Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 2-3 every other 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. urge on to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble similar to 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon every related parts (tps, maf, iac). 0-200 every period I say you will it do the dealer for diagnostics.. on going problems are essentially addendum up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick deformity find if you unplug the meter and control the engine without it. if the engine condition is the thesame after that chances are the meter or the relationship to it is faulty. Its next worth cleaning the MAF sensor wires, as they can get coated similar to dirt more than mature which subsequently offsets the reading. Use some entrance cleaner or brake cleaner to spray onto the wires to separate the dirt upon no account be adjacent to the wires taking into consideration anything as they are very fragile
Hello the TPS does have an effect upon switching the car into idle mode so I'd recommend to create definite the throttle plate is 100% closed and not slightly stranded following carbon. and next familiarize the TPS appropriately that the IDL stick is continuous to the E2 pin in imitation of the throttle is closed, and entre circuit when the throttle is just cracked. Don't badly affect practically any voltages, the IDL contact is the essentially important one.