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 trouble 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. help 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 burden gone 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 craving to be re-adjusted? The master tech did every sorts of diagnostics upon all linked parts (tps, maf, iac). 0-200 all become old I resign yourself to it attain the dealer for diagnostics.. on going problems are truly surcharge up. I m hesitant to touch 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 attain a fast anomaly find if you unplug the meter and rule the engine without it. if the engine condition is the same after that chances are the meter or the connection to it is faulty. Its next worth cleaning the MAF sensor wires, as they can acquire coated behind dirt beyond period which later offsets the reading. Use some right of entry cleaner or brake cleaner to spray can onto the wires to cut off the dirt upon no account lie alongside the wires in the same way as anything as they are unconditionally fragile
Hello the TPS does have an effect upon switching the car into idle mode for that reason I'd recommend to make determined the throttle plate is 100% closed and not slightly ashore next carbon. and later become accustomed the TPS consequently that the IDL fix is continuous to the E2 pin subsequently the throttle is closed, and gain access to circuit next the throttle is just cracked. Don't bother practically any voltages, the IDL log on is the in fact important one.