have you inspected the caps and rotors? have they been changed recently? i have seen them when they are neglected to cause the coil(s) to fail, which may take out the EZL, if there isn't triggering i would say the ezl is bad, not sure if you have enough slack in the harness to do so, you may have to remove the EZL to do it, but see if you can reverse the large harness connectors, if you can and the problem moves to the other side then the EZL is definately an issue

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1967 250 S
1967 280SE
1968 250S
1971 280 SE
1973 220
1974 280 S
1975 450 SEL
1976 220 D
1979 300SD
1983 300 SD
1985 230 TE euro
1986 280SL
1986 500 SEL euro
1986 190E 2.3
1990 300 SE
2003 C230 K
2004 C230 K
1987 560SEL
1987 300SDL now in canada
2005 C230
1998 C43 AMG Sold to DON
1993 190E 2.6
300TD Former daily driver Totaled
current:
R320 CDI
Ram 2500 Cummins