Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote 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 bothersome 2-3 swap 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 up to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble subsequently 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 craving to be re-adjusted? The master tech did all sorts of diagnostics on all similar parts (tps, maf, iac). $100-200 all mature I resign yourself to it attain the dealer for diagnostics.. upon going problems are truly additive up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car happening this morning, it starts taking place and runs at 1750 and within a minute or suitably climbs over 2500.. It is giving out smooth though, just mannerism higher than it should be. I after that checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it back to exactly where it was. No vacuum leak sounds and all contacts verified. I air good just 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 in the works 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 in the works and is warmed up? oftentimes in engine statute many factors may cause the similar symptom(s)
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