Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known 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) upon tps, iac and maf and cleaned the TB. After a pain 2-3 alternating 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. yet had issues. put up to to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune behind 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on all related parts (tps, maf, iac). $100-200 every epoch I take it do the dealer for diagnostics.. upon going problems are in fact tallying 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 as well as 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 every result in insufficient fuel instinctive delivered to the engine. Might next be worth cleaning out the idle enthusiasm govern motor / valve as these get clogged going on as soon as carbon and some brake cleaner washed through helps free things off.
This could be a large vacuum leak ,with the MAF joined it is unaccompanied measuring the air that is getting later than the MAF, fittingly if the intake manifold is sucking in expose the let breathe 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. when carb cleaner spray can spray can in the area of the hissing when the engine giving out and in the same way as 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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