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 burden that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 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. incite to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune next 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon all united parts (tps, maf, iac). $100-200 all period I undertake it pull off the dealer for diagnostics.. upon going problems are in point of fact extra up. I m hesitant to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its also 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 repercussion in insufficient fuel inborn delivered to the engine. Might along with be worth cleaning out the idle speed direct motor / valve as these get clogged in the works considering carbon and some brake cleaner washed through helps release things off.
This could be a large vacuum leak ,with the MAF joined it is unaccompanied measuring the freshen that is getting subsequently the MAF, thus if the intake manifold is sucking in ventilate the expose to fuel ratio will be completely 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 in the place of the hissing similar to the engine running and once you listen the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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