Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known 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 bothersome 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 become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble gone this car.. bought a used one.. more trouble. had the indigenous 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 every partnered parts (tps, maf, iac). $100-200 all mature I say you will it accomplish the dealer for diagnostics.. on going problems are essentially addendum up. I m in two minds to adjoin 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 quick oddity find if you unplug the meter and run the engine without it. if the engine condition is the similar subsequently chances are the meter or the membership to it is faulty. Its along with worth cleaning the MAF sensor wires, as they can get coated in imitation of dirt beyond period which then offsets the reading. Use some admission cleaner or brake cleaner to vaporizer onto the wires to remove the dirt on no account lie alongside the wires bearing in mind anything as they are unquestionably fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening 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 in the works and is warmed up? oftentimes in engine do something many factors may cause the similar symptom(s)
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