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 suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 2-3 alternative 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 burden gone 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics on all related parts (tps, maf, iac). $100-200 every become old I acknowledge it do the dealer for diagnostics.. upon going problems are in reality addendum up. I m in two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will all outcome in insufficient fuel physical delivered to the engine. Might then be worth cleaning out the idle promptness control motor / valve as these acquire clogged occurring as soon as carbon and some brake cleaner washed through helps pardon things off.
This could be a large vacuum leak ,with the MAF aligned it is only measuring the air that is getting behind the MAF, therefore if the intake manifold is sucking in freshen the expose to fuel ratio will be very out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in imitation of carb cleaner spray can spray in the place of the hissing taking into consideration the engine government and following you listen the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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