Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 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. back 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 difficulty subsequent to 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 habit to be re-adjusted? The master tech did every sorts of diagnostics on all partnered parts (tps, maf, iac). 0-200 every time I agree to it accomplish the dealer for diagnostics.. upon going problems are truly supplement up. I m in two minds to lie alongside 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 get a fast aberration locate if you unplug the meter and run the engine without it. if the engine condition is the thesame subsequently chances are the meter or the link to it is faulty. Its then worth cleaning the MAF sensor wires, as they can get coated with dirt higher than times which then offsets the reading. Use some admission cleaner or brake cleaner to spray can onto the wires to remove the dirt on no account be adjacent to the wires later whatever as they are very fragile
Hello the TPS does have an effect on switching the car into idle mode fittingly I'd recommend to make positive the throttle dish is 100% closed and not slightly stranded gone carbon. and after that familiarize the TPS hence that the IDL fasten is continuous to the E2 pin in the manner of the throttle is closed, and get into circuit considering the throttle is just cracked. Don't make miserable more or less any voltages, the IDL entry is the truly important one.