Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present 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) upon tps, iac and maf and cleaned the TB. After bothersome 2-3 stand-in 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 period he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship next 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics upon all united parts (tps, maf, iac). 0-200 all era I agree to it complete the dealer for diagnostics.. on going problems are in reality adding together up. I m hesitant to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might with 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 manage the engine without it. if the engine condition is the similar after that chances are the meter or the link to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated subsequent to dirt on top of time which after that offsets the reading. Use some entre cleaner or brake cleaner to spray onto the wires to remove the dirt upon no account be adjacent to the wires like everything as they are very fragile
Hello the TPS does have an effect upon switching the car into idle mode therefore I'd recommend to create distinct the throttle dish is 100% closed and not slightly ashore subsequently carbon. and after that get used to the TPS so that the IDL attach is continuous to the E2 stick taking into consideration the throttle is closed, and retrieve circuit when the throttle is just cracked. Don't badly affect about any voltages, the IDL read is the in fact important one.