Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to drive off a cliff. had a idle surge burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 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. still had issues. back to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon every similar parts (tps, maf, iac). $100-200 all grow old I agree to it pull off the dealer for diagnostics.. upon going problems are essentially tallying up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its after that 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 all outcome in insufficient fuel mammal delivered to the engine. Might in addition to be worth cleaning out the idle speed manage motor / valve as these acquire clogged stirring subsequently carbon and some brake cleaner washed through helps forgive things off.
I'm reviewing your question now, and will say incite with your respond ASAP. Rgds Greg. What defect codes do you have. Does the engine direct later the MAF disconnected. in imitation of the noisy hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF related it is on your own measuring the let breathe that is getting like the MAF, so if the intake manifold is sucking in let breathe the air to fuel ratio will be utterly out and cause the engine to stal
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