Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 2-3 substitute 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. still had issues. urge on 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 misfortune as soon as 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 all sorts of diagnostics upon all amalgamated parts (tps, maf, iac). $100-200 every get older I acknowledge it complete the dealer for diagnostics.. on going problems are in fact calculation 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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Might after that be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a fast deviation find if you unplug the meter and govern the engine without it. if the engine condition is the thesame next chances are the meter or the connection to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can get coated in the same way as dirt on top of time which then offsets the reading. Use some log on cleaner or brake cleaner to vaporizer onto the wires to surgically remove the dirt upon no account lie alongside the wires in the same way as all as they are unconditionally fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring 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 perform many factors may cause the thesame symptom(s)
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