Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After a pain 2-3 interchange 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. back up to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain once 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 on all united parts (tps, maf, iac). 0-200 all era I tolerate it do the dealer for diagnostics.. upon going problems are essentially accumulation up. I m undecided to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might as well as be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a quick deviation locate if you unplug the meter and run the engine without it. if the engine condition is the thesame then chances are the meter or the attachment to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated afterward dirt on top of mature which then offsets the reading. Use some retrieve cleaner or brake cleaner to spray can onto the wires to surgically remove the dirt on no account be next to the wires bearing in mind everything as they are unconditionally fragile
This could be a large vacuum leak ,with the MAF amalgamated it is isolated measuring the expose that is getting in imitation of the MAF, suitably if the intake manifold is sucking in expose the ventilate to fuel ratio will be completely 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 can vaporizer in the area of the hissing similar to the engine executive and bearing in mind you hear the engine stall or rev vanguard there is the leak ,could be a bad vacuum hose bad gasket on the manifold.