Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 2-3 substitute 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. incite to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain similar to 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 every sorts of diagnostics on all associated parts (tps, maf, iac). 0-200 every mature I take on it accomplish the dealer for diagnostics.. upon going problems are truly calculation up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a fast oddity locate if you unplug the meter and manage the engine without it. if the engine condition is the similar then chances are the meter or the association to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can acquire coated afterward dirt over become old which later offsets the reading. Use some retrieve cleaner or brake cleaner to vaporizer onto the wires to separate the dirt upon no account lie alongside the wires gone anything as they are completely fragile
Hello the TPS does have an effect on switching the car into idle mode correspondingly I'd suggest to create distinct the throttle dish is 100% closed and not slightly stranded following carbon. and later get used to the TPS appropriately that the IDL glue is continuous to the E2 fix once the throttle is closed, and admission circuit later the throttle is just cracked. Don't distress practically any voltages, the IDL edit is the really important one.