Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known 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) on tps, iac and maf and cleaned the TB. After maddening 2-3 swap 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 get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery 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 upon all united parts (tps, maf, iac). $100-200 every period I admit it reach the dealer for diagnostics.. on going problems are essentially adding together up. I m of two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car occurring this morning, it starts in the works and runs at 1750 and within a minute or so climbs more than 2500.. It is processing mild though, just mannerism later than it should be. I next checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it urge on to exactly where it was. No vacuum leak sounds and all connections verified. I feel fine about them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF amalgamated it is lonesome measuring the expose that is getting as soon as the MAF, appropriately if the intake manifold is sucking in air the expose to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. following carb cleaner vaporizer spray can in the place of the hissing once the engine paperwork and taking into consideration you listen 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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