Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive 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 maddening 2-3 rotate 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. support to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common burden like this car.. bought a used one.. more trouble. had the indigenous 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 on every joined parts (tps, maf, iac). 0-200 every mature I acknowledge it pull off the dealer for diagnostics.. on going problems are really supplement up. I m undecided to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might moreover be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a quick idiosyncrasy locate if you unplug the meter and run the engine without it. if the engine condition is the similar later chances are the meter or the membership to it is faulty. Its with worth cleaning the MAF sensor wires, as they can acquire coated with dirt higher than era which after that offsets the reading. Use some gain access to cleaner or brake cleaner to spray can onto the wires to remove the dirt upon no account be adjacent to the wires once everything as they are very fragile
Hello the TPS does have an effect on switching the car into idle mode therefore I'd suggest to make certain the throttle plate is 100% closed and not slightly stranded subsequently carbon. and then get used to the TPS thus that the IDL fasten is continuous to the E2 fasten behind the throttle is closed, and entry circuit similar to the throttle is just cracked. Don't distress more or less any voltages, the IDL entrance is the essentially important one.