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 misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 2-3 rotate 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 grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship past 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 habit to be re-adjusted? The master tech did every sorts of diagnostics on every united parts (tps, maf, iac). $100-200 all mature I understand it get the dealer for diagnostics.. on going problems are in fact extra up. I m hesitant to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might next be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a fast deviation find if you unplug the meter and govern the engine without it. if the engine condition is the thesame later chances are the meter or the attachment to it is faulty. Its next worth cleaning the MAF sensor wires, as they can acquire coated subsequently dirt beyond get older which after that offsets the reading. Use some gate cleaner or brake cleaner to spray can onto the wires to separate the dirt on no account be next to the wires in the same way as all as they are unconditionally fragile
This could be a large vacuum leak ,with the MAF related it is deserted measuring the let breathe that is getting past the MAF, correspondingly if the intake manifold is sucking in air the let breathe 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. taking into account carb cleaner spray spray in the area of the hissing next the engine supervision and considering you listen the engine stall or rev well ahead there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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