Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public 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 a pain 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. encourage to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship with 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon every related parts (tps, maf, iac). $100-200 every era I take on it attain the dealer for diagnostics.. on going problems are truly add-on up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car going on this morning, it starts in the works and runs at 1750 and within a minute or correspondingly climbs beyond 2500.. It is meting out smooth though, just quirk higher than it should be. I then checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and all friends verified. I setting fine very nearly 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 upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms occurring and is warmed up? oftentimes in engine feint many factors may cause the same symptom(s)
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