In your BMW tool kit you will find one of these:
When you are ready to do a valve adjustment (or need to remove the valve cover for any reason), you first need to extract the direct ignition coil/spark plug wire. Take the above coil extractor tool, walk to the nearest trash can, open the lid and drop it in. If you do decide to use it, understand that it is a cheap, flexible plastic piece of sh!t. Proceed with extreme care, and by that I mean you should also apply some pressure from behind the head of the coil with a flat head screwdriver or something similar, and work the coil out VERY slowly. If this is the first time anyone other than a BMW tech has removed the coil it may be extremely tight and difficult to remove. Tight enough that if you choose to simply pull on the coil with this tool alone, as I did, you may find yourself looking at something like this:
In addition to providing a tool ill-suited for its purpose, BMW also designed the plastic coil head in such a way that the end would shear off in response to even a moderate amount of force. Further, in their infinite wisdom, BMW technicians apparently think it's a bad idea to apply a dab of dielectric grease in the hood in order to make subsequent extractions easier.
So, before you start down this road I recommend investing in this substitute tool from Marc Parnes:
It's $25, postage included, and available here: http://www.marcparnes.com/BMW_Plug_Tool.htm
The same cautions apply for the first-time extraction until you grease up the hood, then it's much easier.
Also, the replacement coil ($121 list price plus tax from your local, smiling BMW parts guy; $104 including shipping from Chicago BMW) has a light gray end piece and a different part number from my original. My R is a 2007, built in late 2006, so newer models may have the new part from the factory. The Chicago BMW guy didn't know what had changed, only that BMW had been having a problem with the earlier version. I'm guessing the problem was as described above and the light gray color indicates a tougher plastic end piece.
