Mercedes C350 Wiring Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast 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 grating 2-3 exchange 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. urge on to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship later than this car.. bought a used one.. more trouble. had the native 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics on all joined parts (tps, maf, iac). $100-200 every era I put up with it reach the dealer for diagnostics.. on going problems are in point of fact calculation up. I m of two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Might as well as be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a fast deformity find if you unplug the meter and control the engine without it. if the engine condition is the same next chances are the meter or the attachment to it is faulty. Its then worth cleaning the MAF sensor wires, as they can get coated with dirt beyond become old which subsequently offsets the reading. Use some log on cleaner or brake cleaner to vaporizer onto the wires to cut off the dirt upon no account adjoin the wires taking into consideration whatever as they are definitely fragile

have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring to date on all 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 take steps many factors may cause the similar symptom(s)

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