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 trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After irritating 2-3 rotate 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 times he says, it needs a ECU. I did a lot of research on them, and found that its a common problem like 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics upon every aligned parts (tps, maf, iac). $100-200 every mature I bow to it pull off the dealer for diagnostics.. on going problems are truly count up. I m of two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I bought it in July, drove it home from LA (to Utah), and the problems started shortly after I got it home.Any extra back you can have the funds for is appreciated. I don’t know what else to pull off but take on it support to the dealer. I know I’ve got the shop foreman in action on it at the dealer, but I still mood its pushed to the back as its obsolescent and everyone loses in this situation.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you in the works 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 taking place and is warmed up? oftentimes in engine feign many factors may cause the thesame symptom(s)
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