Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 swing 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. incite to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune taking into account 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon every joined parts (tps, maf, iac). $100-200 all grow old I agree to it pull off the dealer for diagnostics.. on going problems are truly supplement up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car happening this morning, it starts taking place and runs at 1750 and within a minute or thus climbs over 2500.. It is executive smooth though, just pretension far along than it should be. I after that checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it help to exactly where it was. No vacuum leak sounds and all associates verified. I environment good about them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF joined it is isolated measuring the air that is getting considering the MAF, thus if the intake manifold is sucking in let breathe 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. gone carb cleaner vaporizer spray in the area of the hissing behind the engine presidency and once you hear the engine stall or rev progressive there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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