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 difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 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. back to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship in imitation of 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 every aligned parts (tps, maf, iac). $100-200 all times I take it get the dealer for diagnostics.. upon going problems are in reality accumulation up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might moreover be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a fast aberration find if you unplug the meter and manage the engine without it. if the engine condition is the thesame after that chances are the meter or the association to it is faulty. Its plus worth cleaning the MAF sensor wires, as they can acquire coated later dirt beyond era which subsequently offsets the reading. Use some admission cleaner or brake cleaner to spray onto the wires to surgically remove the dirt upon no account adjoin the wires when anything as they are unconditionally fragile
This could be a large vacuum leak ,with the MAF related it is and no-one else measuring the ventilate that is getting subsequent to the MAF, therefore if the intake manifold is sucking in expose the ventilate to fuel ratio will be unconditionally out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. afterward carb cleaner spray vaporizer in the area of the hissing following the engine giving out and subsequent to you hear the engine stall or rev future there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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