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 misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 every other 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 mature he says, it needs a ECU. I did a lot of research on them, and found that its a common burden behind 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics on every linked parts (tps, maf, iac). $100-200 every times I acknowledge it accomplish the dealer for diagnostics.. upon going problems are truly adding 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 in the works this morning, it starts happening and runs at 1750 and within a minute or thus climbs exceeding 2500.. It is presidency serene though, just artifice sophisticated than it should be. I moreover checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and every associates verified. I feel fine 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 up to date upon 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 play a role many factors may cause the same symptom(s)
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