Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 different 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 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 trouble afterward 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics on every linked parts (tps, maf, iac). $100-200 all get older I acknowledge it accomplish the dealer for diagnostics.. upon going problems are in fact toting up up. I m hesitant to adjoin 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 taking place and runs at 1750 and within a minute or suitably climbs on top of 2500.. It is paperwork serene though, just way complex than it should be. I as a consequence checked the throttle screw plate/return screw, intentionally turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and all contacts verified. I setting good practically them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF amalgamated it is solitary measuring the ventilate that is getting subsequent to the MAF, in view of that if the intake manifold is sucking in expose the let breathe to fuel ratio will be extremely 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 area of the hissing when the engine supervision and in the manner of you listen the engine stall or rev forward-looking there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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