Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 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. still had issues. back up to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem once 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics on every amalgamated parts (tps, maf, iac). 0-200 all become old I understand it realize the dealer for diagnostics.. upon going problems are essentially adding up. I m unsure to lie alongside 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 pull off a fast malformation locate if you unplug the meter and control the engine without it. if the engine condition is the thesame subsequently chances are the meter or the connection to it is faulty. Its next worth cleaning the MAF sensor wires, as they can acquire coated subsequent to dirt higher than era which then offsets the reading. Use some get into cleaner or brake cleaner to vaporizer onto the wires to separate the dirt on no account be adjacent to the wires later than whatever as they are agreed fragile
This could be a large vacuum leak ,with the MAF similar it is lonely measuring the ventilate that is getting later the MAF, therefore if the intake manifold is sucking in air the freshen to fuel ratio will be unquestionably out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequent to carb cleaner spray vaporizer in the place of the hissing when the engine running and like you hear the engine stall or rev vanguard there is the leak ,could be a bad vacuum hose bad gasket on the manifold.