E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

Curious....

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Old 05-05-2008, 04:15 PM
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'90 300E Blk/Tan
Curious....

What is the deal with the "setting" knob on the top of the ECU (the one with positions of 0 or 1), and where should it be set?

Not touching it - just checking on what the deal with that knob is.. ('90 300E 3.0L )
Old 05-05-2008, 07:07 PM
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1990 300ce 24v I6
That thing locks the ECU into the frame Defiantely have it on 1 (locked)
Old 05-06-2008, 10:32 AM
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'90 300E Blk/Tan
Thanks Saijin.
Old 05-06-2008, 12:29 PM
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1990 300ce
I believe that's your MAS Control unit, and yes. All that knob does is hold it there. It's not an electronic knob.
Old 05-06-2008, 12:44 PM
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1990 300ce 24v I6
No problem mang. While you are in there, maybe clean out the contacts with contact cleaner. Thats what we did :P

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