Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to steer 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 trying 2-3 vary 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. back to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain bearing in mind 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 upon all associated parts (tps, maf, iac). $100-200 every epoch I endure it get the dealer for diagnostics.. on 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 bought it in July, drove it house from LA (to Utah), and the problems started sharply after I got it home.Any further back up you can pay for is appreciated. I don't know what else to accomplish but take it help to the dealer. I know I've got the shop foreman working upon it at the dealer, but I nevertheless setting its pushed to the urge on as its obsolete 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 every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms happening and is warmed up? oftentimes in engine con many factors may cause the similar symptom(s)
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