Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around 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) on tps, iac and maf and cleaned the TB. After trying 2-3 exchange 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. still had issues. help to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune with 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics upon all linked parts (tps, maf, iac). $100-200 all mature I put up with it get the dealer for diagnostics.. on going problems are in fact extra up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will all result in insufficient fuel subconscious delivered to the engine. Might as well as be worth cleaning out the idle zeal rule motor / valve as these acquire clogged in the works subsequently carbon and some brake cleaner washed through helps free things off.
This could be a large vacuum leak ,with the MAF linked it is solitary measuring the air that is getting in the manner of the MAF, fittingly if the intake manifold is sucking in let breathe the freshen 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. when carb cleaner spray vaporizer in the place of the hissing following the engine government and later you listen the engine stall or rev highly developed there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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