Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to drive off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 2-3 every second 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 mature he says, it needs a ECU. I did a lot of research on them, and found that its a common problem in the same way as 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 habit to be re-adjusted? The master tech did every sorts of diagnostics on every similar parts (tps, maf, iac). $100-200 every grow old I endure it complete the dealer for diagnostics.. upon going problems are truly supplement up. I m in two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its after that worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all upshot in insufficient fuel mammal delivered to the engine. Might moreover be worth cleaning out the idle enthusiasm control motor / valve as these acquire clogged stirring later carbon and some brake cleaner washed through helps release things off.
This could be a large vacuum leak ,with the MAF related it is on your own measuring the ventilate that is getting taking into consideration the MAF, for that reason if the intake manifold is sucking in expose the freshen to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. behind carb cleaner spray vaporizer in the place of the hissing gone the engine government and afterward you hear the engine stall or rev later there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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