Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge burden that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 2-3 rotate 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. help to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering like 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 linked parts (tps, maf, iac). $100-200 every era I give a positive response it attain the dealer for diagnostics.. upon going problems are really count up. I m of two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I did re-check them tho. The master tech did extensive tests on the expose flow meter and said it was good. when I unplug it and rule the motor, the car runs rasping and at 850ish. I can by yourself guess that my additional rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of all this. I don't think the tps has that much manage in the vary of rpm though? I think it unaided adjusts it all but 1k..
This could be a large vacuum leak ,with the MAF combined it is unaided measuring the expose that is getting when the MAF, so 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. past carb cleaner spray can vaporizer in the area of the hissing afterward the engine management and in imitation of you hear the engine stall or rev highly developed there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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