Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 2-3 vary 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. yet had issues. help to the dealer.. this mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering past 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 on every similar parts (tps, maf, iac). 0-200 all era I put up with it get the dealer for diagnostics.. upon going problems are essentially calculation up. I m of two minds 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 complete a quick irregularity locate if you unplug the meter and rule 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 acquire coated taking into consideration dirt beyond time which after that offsets the reading. Use some get into cleaner or brake cleaner to vaporizer onto the wires to sever the dirt on no account be next to the wires afterward all as they are completely fragile
Hello the TPS does have an effect on switching the car into idle mode consequently I'd suggest to make clear the throttle dish is 100% closed and not slightly beached in the same way as carbon. and after that get used to the TPS appropriately that the IDL stick is continuous to the E2 fasten past the throttle is closed, and right of entry circuit past the throttle is just cracked. Don't bother approximately any voltages, the IDL door is the truly important one.