One of the members recently posted a link (on TSBs?).... well I found out some cool info about my car (the engine)!
" *Light it up
The ignition part of the system is distributorless, and has some interesting features. To begin with, when it's below freezing out, it provides multiple sparks while cranking to get you fired up.
During an overheating emergency, timing is retarded under load to prevent internal engine damage. Engine speed, air mass, and coolant and intake air temp are all used to determine how much retard is prudent. This is not to be confused with the practice sometimes used in the distant past of advancing timing at idle to cool down combustion.
Speaking of overheating, to keep the cat from getting into that damaging syndrome injection is killed to any cylinder that's lost spark for any reason. Ergo, raw fuel won't get pumped into that catalytic furnace.
Primary connections carry over 400 V, enough to bite you. Make sure the core bracket is grounded. By the way, primary current is limited to seven amps, and the max secondary voltage is about 32 kV. As you probably know, the waste spark on the exhaust stroke requires very little energy, so most of the pop goes to the plug that's encountering compression.."
Wow, that's totally amazing! So I now think that the injectors turn off (IE, shutting off the cylinder(s) for the cylinder(s) that had the misfire. I am getting the codes read today, and I'll see if it's a random cylinder misfire, or a specific cylinder (or 2 specific ones ... =coil?), to get a better idea.
I have a $600 estimate to change the coils (parts [x 3 coils] & labor) from the MB dealer. DOes this sound like an expected
amount $$$ to change the coils on an M104 from the dealer?