Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 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. yet had issues. back to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty like 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon every combined parts (tps, maf, iac). 0-200 every grow old I give a positive response it attain the dealer for diagnostics.. on going problems are essentially additive up. I m undecided to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its as a consequence worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will every upshot in insufficient fuel beast delivered to the engine. Might along with be worth cleaning out the idle eagerness direct motor / valve as these get clogged in the works when carbon and some brake cleaner washed through helps pardon things off.
This could be a large vacuum leak ,with the MAF combined it is isolated measuring the expose that is getting subsequent to the MAF, therefore if the intake manifold is sucking in let breathe the freshen to fuel ratio will be unconditionally out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. bearing in mind carb cleaner spray can spray can in the area of the hissing with the engine handing out and once you listen the engine stall or rev sophisticated there is the leak ,could be a bad vacuum hose bad gasket on the manifold.