David S Poole, I just found out that I'm not getting any spark on my plugs and Ignition coil. Tested coil to be good so I suspect it to be an ICU issue (unless you have some more idea for me to check). Can you please give me instructions on how to test the Ignition Control module on my 1985 380SL. Another thing I want to ask in I can switch the ICM of my 1980 450SLC to my 1985 380SL just to troubleshoot my problem. Thanks and Regards