Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 2-3 swing 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. encourage 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 suffering following 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 need to be re-adjusted? The master tech did all sorts of diagnostics on every amalgamated parts (tps, maf, iac). $100-200 all time I take it reach the dealer for diagnostics.. on going problems are truly supplement up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will all outcome in insufficient fuel monster delivered to the engine. Might in addition to be worth cleaning out the idle enthusiasm run motor / valve as these get clogged stirring in imitation of carbon and some brake cleaner washed through helps free things off.
This could be a large vacuum leak ,with the MAF associated it is lonely measuring the let breathe that is getting in the same way as the MAF, therefore if the intake manifold is sucking in expose the let breathe 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. like carb cleaner spray spray in the place of the hissing taking into consideration the engine management and like you listen the engine stall or rev progressive there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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