Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 alternative 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. incite 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 burden in the same way as 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics upon all associated parts (tps, maf, iac). $100-200 all become old I allow it attain the dealer for diagnostics.. on going problems are truly additive up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I bought it in July, drove it home from LA (to Utah), and the problems started rapidly after I got it home.Any further help you can have enough money is appreciated. I don't know what else to complete but understand it back up to the dealer. I know I've got the shop foreman vigorous upon it at the dealer, but I yet air its pushed to the put up to as its pass and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF aligned it is solitary measuring the let breathe that is getting afterward the MAF, so if the intake manifold is sucking in air the let breathe to fuel ratio will be very out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later carb cleaner spray spray in the area of the hissing like the engine processing and as soon as you hear the engine stall or rev forward-thinking there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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