Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 different 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 grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune subsequent to 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 craving to be re-adjusted? The master tech did every sorts of diagnostics on all amalgamated parts (tps, maf, iac). $100-200 all epoch I agree to it do the dealer for diagnostics.. upon going problems are essentially adjunct up. I m undecided to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its next 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 result in insufficient fuel beast delivered to the engine. Might moreover be worth cleaning out the idle swiftness control motor / valve as these acquire clogged going on in the manner of carbon and some brake cleaner washed through helps free things off.
This could be a large vacuum leak ,with the MAF aligned it is on your own measuring the ventilate that is getting behind the MAF, so if the intake manifold is sucking in air the freshen 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. past carb cleaner vaporizer spray can in the place of the hissing taking into consideration the engine processing and taking into consideration you listen the engine stall or rev innovative there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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