Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to drive 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 aggravating 2-3 vary 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. assist to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty following 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics on all amalgamated parts (tps, maf, iac). 0-200 every get older I acknowledge it get the dealer for diagnostics.. upon going problems are in point of fact appendage up. I m hesitant to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a quick oddity find if you unplug the meter and control the engine without it. if the engine condition is the same subsequently chances are the meter or the association to it is faulty. Its next worth cleaning the MAF sensor wires, as they can acquire coated once dirt higher than grow old which after that offsets the reading. Use some entre cleaner or brake cleaner to spray can onto the wires to sever the dirt on no account lie alongside the wires next all as they are enormously fragile
I don't have any check engine lights unless I unplug the MAF sensor. subsequently the MAF is plugged in then the car will stall unless I put my foot upon the accelerator. There is furthermore an intermittent popping strong coming at idle.