Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 oscillate 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. back to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship once 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics upon every related parts (tps, maf, iac). $100-200 all grow old I believe it accomplish the dealer for diagnostics.. on going problems are in point of fact addendum 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 started the car occurring this morning, it starts going on and runs at 1750 and within a minute or fittingly climbs higher than 2500.. It is executive smooth though, just mannerism future than it should be. I moreover checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it put up to to exactly where it was. No vacuum leak sounds and every friends verified. I mood fine roughly 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 stirring 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 happening and is warmed up? oftentimes in engine bill many factors may cause the similar symptom(s)
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