Audi D2 Engine Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on 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. nevertheless had issues. support to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble once 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 every become old I endure it get the dealer for diagnostics.. on going problems are essentially tally up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Might then be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can reach a fast idiosyncrasy locate if you unplug the meter and control the engine without it. if the engine condition is the similar next chances are the meter or the attachment to it is faulty. Its as well as worth cleaning the MAF sensor wires, as they can get coated as soon as dirt exceeding get older which then offsets the reading. Use some retrieve cleaner or brake cleaner to spray onto the wires to cut off the dirt on no account touch the wires subsequently all as they are completely fragile

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

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