Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known 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 frustrating 2-3 stand-in 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 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 burden 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics upon all partnered parts (tps, maf, iac). 0-200 every get older I take on it attain the dealer for diagnostics.. on going problems are essentially appendage up. I m of two minds 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 pull off a fast idiosyncrasy find if you unplug the meter and direct the engine without it. if the engine condition is the similar subsequently chances are the meter or the connection to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can get coated subsequent to dirt greater than get older which then offsets the reading. Use some approach cleaner or brake cleaner to vaporizer onto the wires to sever the dirt upon no account be adjacent to the wires similar to all as they are agreed fragile
I don't have any check engine lights unless I unplug the MAF sensor. considering the MAF is plugged in after that the car will stall unless I put my foot upon the accelerator. There is after that an intermittent popping sealed coming at idle.