My 400E came home in limp mode as it was running on only 4 cylinders. What a dog she was! After checking, found that my driver's side coil has no output. First checked coil wire, then back to coil and it has voltage, then on to to voltage triggering with the motor running. OOOps, no triggering as compared to the passenger side coil. Before buying an expensive litle box called a EZL control unit, is there any other way to isolate the cause of the the coil output failure?
I have found an EZL unit (015 545 60 32) at a good price and probably should buy it just to have one handy as they are a 'weak link' on these motors and not always found easily. That's when Murphy's law steps in....can't find it when you need it!

Thanks for any advice given....

Tobias MB
190/5.8 track car