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 misfortune that I researched online and did tests (per the manual) upon 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. support to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble considering 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon all amalgamated parts (tps, maf, iac). $100-200 all era I say you will it reach the dealer for diagnostics.. on going problems are in reality adding together up. I m hesitant to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me tell you a little more roughly the misery history. It currently has a master tech certified idle freshen govern valve and tps installed. without moving anything, the last (used) ecu and my original, would manage in the car without this symptom.
This could be a large vacuum leak ,with the MAF joined it is on your own measuring the ventilate that is getting following the MAF, appropriately if the intake manifold is sucking in expose the ventilate to fuel ratio will be agreed out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in the same way as carb cleaner vaporizer spray can in the area of the hissing with the engine management and considering you hear the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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