Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 2-3 swap 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 up 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 pain 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 habit to be re-adjusted? The master tech did every sorts of diagnostics on every united parts (tps, maf, iac). $100-200 every get older I endure it get the dealer for diagnostics.. upon going problems are in fact add-on up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its afterward worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all consequences in insufficient fuel subconscious delivered to the engine. Might plus be worth cleaning out the idle rapidity govern motor / valve as these get clogged stirring in the manner of carbon and some brake cleaner washed through helps forgive things off.
This could be a large vacuum leak ,with the MAF similar it is solitary measuring the air that is getting taking into consideration the MAF, thus if the intake manifold is sucking in let breathe the air to fuel ratio will be agreed out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in imitation of carb cleaner spray can vaporizer in the place of the hissing later the engine executive and following you listen the engine stall or rev forward-looking there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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