Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge suffering 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. nevertheless had issues. help to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship as soon as 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 habit to be re-adjusted? The master tech did every sorts of diagnostics on all joined parts (tps, maf, iac). 0-200 all era I consent it do the dealer for diagnostics.. on going problems are in fact adjunct up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might furthermore be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can reach a quick deviation find if you unplug the meter and govern the engine without it. if the engine condition is the similar next chances are the meter or the attachment to it is faulty. Its as well as worth cleaning the MAF sensor wires, as they can get coated once dirt higher than epoch which subsequently offsets the reading. Use some right of entry cleaner or brake cleaner to vaporizer onto the wires to surgically remove the dirt upon no account touch the wires with anything as they are no question fragile
I don't have any check engine lights unless I unplug the MAF sensor. with the MAF is plugged in after that the car will stall unless I put my foot upon the accelerator. There is furthermore an intermittent popping hermetic coming at idle.