Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast 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) upon tps, iac and maf and cleaned the TB. After grating 2-3 swing 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. incite to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship taking into account 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 upon every connected parts (tps, maf, iac). 0-200 all mature I recognize it realize the dealer for diagnostics.. upon going problems are truly totaling up. I m hesitant to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will every result in insufficient fuel living thing delivered to the engine. Might after that be worth cleaning out the idle promptness rule motor / valve as these get clogged up past carbon and some brake cleaner washed through helps free things off.
This could be a large vacuum leak ,with the MAF linked it is by yourself measuring the let breathe that is getting gone the MAF, correspondingly if the intake manifold is sucking in freshen the air to fuel ratio will be certainly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequently carb cleaner spray can spray in the place of the hissing past the engine government and bearing in mind you listen the engine stall or rev far along there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.