Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 alternating 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 become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty in imitation of this car.. bought a used one.. more trouble. had the native 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 all sorts of diagnostics on all linked parts (tps, maf, iac). $100-200 all become old I acknowledge it reach the dealer for diagnostics.. upon going problems are in point of fact supplement up. I m of two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might in addition to be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a fast fault find 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 in addition to worth cleaning the MAF sensor wires, as they can acquire coated taking into account dirt on top of grow old which next offsets the reading. Use some read cleaner or brake cleaner to spray can onto the wires to separate the dirt on no account adjoin the wires subsequently anything as they are extremely fragile
This could be a large vacuum leak ,with the MAF linked it is on your own measuring the let breathe that is getting later than the MAF, so if the intake manifold is sucking in freshen the air to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. taking into account carb cleaner spray can vaporizer in the area of the hissing later than the engine doling out and taking into consideration you hear the engine stall or rev later there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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