Alright dude, Lets try this systematically:
1) Federal or Cali Car?
2) Duty Cycle Read out (x11) at op temp idle and 2500rpm?
3) If constant %, then we got a fault.
4) If not constant %, we're gonna test all the CIS-E mixture related devices.
This is from a 560SEL, but most of the same stuff is in the 124 m103. The m103 126 didnt have a nice diagram like this...
Make sure each component is working within normal parameters, then make sure the CIS-E computer is getting the data.
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