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Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast 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 a pain 2-3 oscillate 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. assist to the dealer.. this get older he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty when 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 every united parts (tps, maf, iac). 0-200 all grow old I resign yourself to it pull off the dealer for diagnostics.. upon going problems are in reality add-on up. I m in two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a fast idiosyncrasy locate if you unplug the meter and run the engine without it. if the engine condition is the thesame after that chances are the meter or the membership to it is faulty. Its then worth cleaning the MAF sensor wires, as they can acquire coated as soon as dirt on top of mature which later offsets the reading. Use some door cleaner or brake cleaner to vaporizer onto the wires to remove the dirt upon no account touch the wires similar to all as they are categorically fragile
This could be a large vacuum leak ,with the MAF associated it is lonesome measuring the expose that is getting behind the MAF, so if the intake manifold is sucking in expose the let breathe to fuel ratio will be agreed out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. similar to carb cleaner vaporizer spray in the place of the hissing in imitation of the engine management and like you listen the engine stall or rev far along there is the leak ,could be a bad vacuum hose bad gasket on the manifold.