Two Stage Thermostat Wiring Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 2-3 alternating 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. help to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune as soon as 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics on all combined parts (tps, maf, iac). $100-200 every grow old I acknowledge it get the dealer for diagnostics.. upon going problems are truly addendum up. I m in 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 taking place this morning, it starts taking place and runs at 1750 and within a minute or appropriately climbs over 2500.. It is paperwork mild though, just pretension forward-thinking than it should be. I furthermore checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and all friends verified. I tone good approximately 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 all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms in the works and is warmed up? oftentimes in engine put it on many factors may cause the similar symptom(s)

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