Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 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. yet had issues. support to the dealer.. this mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship following 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon every amalgamated parts (tps, maf, iac). $100-200 all period I put up with it attain the dealer for diagnostics.. upon going problems are truly adding together up. I m hesitant to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast deviation find if you unplug the meter and govern the engine without it. if the engine condition is the similar subsequently chances are the meter or the membership to it is faulty. Its next worth cleaning the MAF sensor wires, as they can get coated considering dirt greater than era which then offsets the reading. Use some door cleaner or brake cleaner to vaporizer onto the wires to separate the dirt on no account adjoin the wires in the manner of anything as they are enormously fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you up 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 up and is warmed up? oftentimes in engine discharge duty many factors may cause the thesame symptom(s)
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