Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to drive off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 exchange 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. put up to 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 problem behind this car.. bought a used one.. more trouble. had the original 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 craving to be re-adjusted? The master tech did all sorts of diagnostics on every amalgamated parts (tps, maf, iac). 0-200 all epoch I tolerate it attain the dealer for diagnostics.. upon going problems are essentially tallying up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a quick irregularity find if you unplug the meter and run the engine without it. if the engine condition is the same then chances are the meter or the attachment to it is faulty. Its also worth cleaning the MAF sensor wires, as they can acquire coated taking into consideration dirt greater than times which after that offsets the reading. Use some approach cleaner or brake cleaner to vaporizer onto the wires to cut off the dirt upon no account lie alongside the wires when all as they are definitely fragile
I don't have any check engine lights unless I unplug the MAF sensor. in the same way as the MAF is plugged in subsequently the car will stall unless I put my foot on the accelerator. There is furthermore an intermittent popping unassailable coming at idle.