Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to steer off a cliff. had a idle surge hardship 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. nevertheless had issues. urge on to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery subsequently 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 all sorts of diagnostics upon every joined parts (tps, maf, iac). $100-200 every period I agree to it attain the dealer for diagnostics.. upon going problems are really accumulation up. I m unsure 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 going on and runs at 1750 and within a minute or so climbs exceeding 2500.. It is dispensation serene though, just quirk forward-looking than it should be. I as a consequence checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and every contacts verified. I vibes fine more or less them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF associated it is deserted measuring the freshen that is getting behind the MAF, suitably if the intake manifold is sucking in ventilate the expose to fuel ratio will be certainly 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 vaporizer spray in the area of the hissing behind the engine government and like you hear the engine stall or rev far ahead there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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