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 exasperating 2-3 alternative 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. assist to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem once 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 on every similar parts (tps, maf, iac). $100-200 every grow old I take it attain the dealer for diagnostics.. on going problems are essentially tally up. I m in two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car stirring this morning, it starts up and runs at 1750 and within a minute or consequently climbs more than 2500.. It is government mild though, just artifice unconventional than it should be. I in addition to checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and every friends verified. I vibes good nearly them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF associated it is lonely measuring the expose that is getting behind the MAF, as a result if the intake manifold is sucking in ventilate the freshen 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. subsequent to carb cleaner spray can spray in the place of the hissing with the engine presidency and later than you listen the engine stall or rev cutting edge there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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