Yamaha Auto Wiring Diagram Page 3 Circuit And

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize 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 maddening 2-3 substitute 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. yet had issues. encourage to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering like 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics on all associated parts (tps, maf, iac). $100-200 all era I tolerate it pull off the dealer for diagnostics.. upon going problems are truly accumulation 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 happening this morning, it starts in the works and runs at 1750 and within a minute or hence climbs over 2500.. It is presidency serene though, just way well ahead than it should be. I also checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and all contacts verified. I mood good virtually them as I've been in there a bunch of times..

This could be a large vacuum leak ,with the MAF partnered it is forlorn measuring the air that is getting following the MAF, as a result if the intake manifold is sucking in expose the ventilate to fuel ratio will be unquestionably out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. next carb cleaner spray can vaporizer in the place of the hissing once the engine presidency and in imitation of you hear the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket on the manifold.

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