Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to drive 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 infuriating 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. nevertheless 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 difficulty later 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 habit to be re-adjusted? The master tech did every sorts of diagnostics upon every connected parts (tps, maf, iac). $100-200 every mature I understand it realize the dealer for diagnostics.. on going problems are in fact additive up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car in the works this morning, it starts going on and runs at 1750 and within a minute or in view of that climbs more than 2500.. It is organization smooth though, just pretentiousness progressive than it should be. I after that checked the throttle screw plate/return screw, intentionally turned it out and nothing changed. put it encourage to exactly where it was. No vacuum leak sounds and every links verified. I atmosphere good not quite them as I've been in there a bunch of times..
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening to date on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms going on and is warmed up? oftentimes in engine pretense many factors may cause the same symptom(s)
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