94 c220 rpm fluctuating - Page 3 - Mercedes-Benz Forum
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#21 (permalink) Old 11-15-2012, 04:18 PM
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Date registered: Oct 2012
Vehicle: 1994 Mercedes C220
Location: Flemington, NJ
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geeze! ok, here are the codes. 3,4,5,8,11,13,22,24,25,30,39,47,49,and 50

Do you think it is because we didnt reset the computer since the wiring was replaced? there were a ton of shorts in the old harness
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#22 (permalink) Old 11-15-2012, 06:06 PM
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Date registered: Oct 2012
Vehicle: 1994 Mercedes C220
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Ok, so we cleared all codes with the blink code reader and reset the ecu. Afterwards, we drove the car around for about 2 minutes without a problem before getting the fluctuations again. When we brought the car back, we had a code #5 and 8. We cleared those codes then drove it around some more and the problem persisted, and the codes appeared again. We also disconnected the MAF and it didnt make a difference.

Last edited by greasemonkeyjoe; 11-17-2012 at 09:24 AM.
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#23 (permalink) Old 11-19-2012, 09:22 AM
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Date registered: Dec 2011
Vehicle: 1996 C220 Auto-tragic
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When you replaced the wiring harness did you check the wiring from the harness connector (X1) to the throttle actuator. Mine was also deteriorated and I have to replace the wiring connecting the actuator to the main harness.

The actuator has two potentiometers which read the throttle position, one goes to the CC module and the other to the ECM. There is a throttle stop switch and the throttle actuator DC motor. If any of this wiring is shorted, you will have strange ECM behavior. These codes point to an issue with the throttle actuator or wiring. Look at these items closely.

You MAF is probably fine if you are not getting codes #4 and (or) #13.
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#24 (permalink) Old 11-19-2012, 01:46 PM
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yes i did replace the harness to the throttle actuator. All i did with the throttle body and engine harness was cut out one wire at a time, then re-sodder and heat shrink all new wires in. Now im second guessing... maybe i screwed something up... im wondering if i should just buy a brand new wiring harness and throttle body. ugh! but thats alot of money
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