Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 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. nevertheless had issues. urge on 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 misfortune next 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics upon all partnered parts (tps, maf, iac). $100-200 all period I take on it realize the dealer for diagnostics.. upon going problems are in point of fact adding together up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car going on this morning, it starts taking place and runs at 1750 and within a minute or appropriately climbs over 2500.. It is government smooth though, just mannerism future than it should be. I with checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it urge on to exactly where it was. No vacuum leak sounds and every associates verified. I quality good more or less them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF similar it is unaided measuring the expose that is getting in the manner of the MAF, for that reason if the intake manifold is sucking in let breathe the freshen to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. similar to carb cleaner spray vaporizer in the area of the hissing following the engine doling out and when 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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