Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 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. encourage to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship like 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics upon every combined parts (tps, maf, iac). $100-200 every get older I agree to it complete the dealer for diagnostics.. on going problems are really addendum up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car up this morning, it starts happening and runs at 1750 and within a minute or suitably climbs exceeding 2500.. It is admin serene though, just quirk later than it should be. I plus checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it back up to exactly where it was. No vacuum leak sounds and all contacts verified. I mood good about 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 taking place to date on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms up and is warmed up? oftentimes in engine do its stuff many factors may cause the thesame symptom(s)
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