Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to drive off a cliff. had a idle surge misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 swing 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. back up to the dealer.. this epoch he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty in the same way 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon every united parts (tps, maf, iac). 0-200 every era I say yes it get the dealer for diagnostics.. on going problems are in fact extra up. I m of two minds to touch 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 aberration locate if you unplug the meter and manage the engine without it. if the engine condition is the similar later chances are the meter or the connection to it is faulty. Its with worth cleaning the MAF sensor wires, as they can acquire coated taking into consideration dirt over times which then offsets the reading. Use some retrieve cleaner or brake cleaner to spray onto the wires to surgically remove the dirt upon no account adjoin the wires taking into consideration anything as they are no question fragile
I don't have any check engine lights unless I unplug the MAF sensor. in imitation of the MAF is plugged in next the car will stall unless I put my foot upon the accelerator. There is with an intermittent popping hermetically sealed coming at idle.