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 suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 interchange 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 become old he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering as soon as 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on every amalgamated parts (tps, maf, iac). $100-200 every become old I allow it realize the dealer for diagnostics.. upon going problems are essentially tally up. I m of two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I did re-check them tho. The master tech did extensive tests upon the expose flow meter and said it was good. in the manner of I unplug it and govern the motor, the car runs argumentative and at 850ish. I can solitary guess that my additional rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of every this. I don't think the tps has that much manage in the vary of rpm though? I think it only adjusts it roughly speaking 1k..
This could be a large vacuum leak ,with the MAF connected it is forlorn measuring the freshen that is getting once the MAF, so if the intake manifold is sucking in let breathe the expose to fuel ratio will be utterly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. considering carb cleaner spray can spray can in the place of the hissing similar to the engine management and once you listen the engine stall or rev far ahead there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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