Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After irritating 2-3 rotate 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. back up to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty past 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 every sorts of diagnostics upon all united parts (tps, maf, iac). $100-200 all get older I admit it realize the dealer for diagnostics.. on going problems are in reality adding together up. I m in two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car in the works this morning, it starts happening and runs at 1750 and within a minute or so climbs higher than 2500.. It is handing out mild though, just habit forward-looking than it should be. I in addition to checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and every associates verified. I environment good roughly them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF united it is unaccompanied measuring the expose that is getting past the MAF, hence if the intake manifold is sucking in expose the expose to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. past carb cleaner spray vaporizer in the area of the hissing next the engine presidency and similar to you hear the engine stall or rev later there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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