Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around 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 aggravating 2-3 swing 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. back to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common burden with 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 craving to be re-adjusted? The master tech did every sorts of diagnostics on all amalgamated parts (tps, maf, iac). $100-200 all period I believe it complete the dealer for diagnostics.. upon going problems are truly accumulation up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car going on this morning, it starts occurring and runs at 1750 and within a minute or in view of that climbs more than 2500.. It is doling out smooth though, just habit unconventional than it should be. I next checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it help to exactly where it was. No vacuum leak sounds and every links verified. I tone fine virtually 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 occurring 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 stirring and is warmed up? oftentimes in engine be in many factors may cause the similar symptom(s)
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