Wiring Double Schematic Box

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 trouble 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. yet had issues. back up 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 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 craving to be re-adjusted? The master tech did every sorts of diagnostics upon every linked parts (tps, maf, iac). $100-200 every period I take on it pull off the dealer for diagnostics.. upon going problems are truly tally up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a quick malformation find if you unplug the meter and rule the engine without it. if the engine condition is the same subsequently chances are the meter or the membership to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can get coated in the manner of dirt higher than grow old which later offsets the reading. Use some gain access to cleaner or brake cleaner to vaporizer onto the wires to sever the dirt on no account adjoin the wires past all as they are enormously fragile

I don't have any check engine lights unless I unplug the MAF sensor. considering the MAF is plugged in subsequently the car will stall unless I put my foot upon the accelerator. There is along with an intermittent popping unquestionable coming at idle.

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