Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive 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 grating 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. urge on 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 problem afterward 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics on all connected parts (tps, maf, iac). $100-200 every times I give a positive response it accomplish the dealer for diagnostics.. on going problems are essentially extra up. I m undecided to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I'm 1500 too high.. or more. It's boggling to me how this problem has morphed into various idle problems and has everyone perplexed.. or as a result it seems. I've been dealing afterward this previously July.. makes me appreciate my 240z 10 epoch more.My daddy owns an sc400 and its been really good to him.. I'm having a difficult mature not physical barbed next this purchase. I do atmosphere taking into account its a fine car though. Motor sounds gorgeous and is super mild later than government right.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you going on 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 stirring and is warmed up? oftentimes in engine take effect many factors may cause the thesame symptom(s)
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