Simple Car Engine Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push 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 maddening 2-3 alternative 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. nevertheless had issues. help to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune as soon as 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics upon all related parts (tps, maf, iac). $100-200 every time I put up with it attain the dealer for diagnostics.. on going problems are in fact additive up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Might with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick irregularity locate if you unplug the meter and manage the engine without it. if the engine condition is the same subsequently chances are the meter or the relationship to it is faulty. Its with worth cleaning the MAF sensor wires, as they can acquire coated later dirt on top of times which subsequently offsets the reading. Use some get into cleaner or brake cleaner to vaporizer onto the wires to separate the dirt on no account touch the wires considering anything as they are completely fragile

have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you up 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 taking place and is warmed up? oftentimes in engine take action many factors may cause the same symptom(s)

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