1992 190E-2.3, I disconnected the ignition-coil wire to check the compression test of the cylinders. After I finished and connected everything back the car wouldn't start (no spark). The car was running fine before. I may not have grounded the ignition-coil wire properly during the test. A mechanic suggested the "ignition control unit" may have blown, therefore I replaced it with a used part from a junk yard, but it didn't solve the problem. I checked the ignition coil with an ohm-meter and it's almost within specs, the primary contact is 0.7 ohm (spec is 0.3-0.6 ohm) and the secondary is 11,100 (spec is 8,000 - 13,000 ohm). Is the coil bad for having 0.7 ohm (slightly out of spec)? Does any body have an idea how to diagnose this problem, before I start replacing everything? Thanks in advance.