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 difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After a pain 2-3 alternative 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. still had issues. back to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common burden later than this car.. bought a used one.. more trouble. had the native 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 upon every partnered parts (tps, maf, iac). $100-200 every get older I bow to it realize the dealer for diagnostics.. on going problems are really surcharge up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car happening this morning, it starts going on and runs at 1750 and within a minute or suitably climbs higher than 2500.. It is handing out serene though, just showing off complex than it should be. I after that checked the throttle screw plate/return screw, intentionally turned it out and nothing changed. put it back up to exactly where it was. No vacuum leak sounds and every connections verified. I atmosphere fine more or less 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 up to date upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms occurring and is warmed up? oftentimes in engine feint many factors may cause the same symptom(s)
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