Just to muddy up the works I can tell you that the ammount of energy used in every coil firing is the same. The secondary disapation of that energy is done by voltage over time. The conditions the coil sees on the secondary are varied. They include the wires, the state of the plugs, the entire current path, but most importantly the environment in the cylinder. The disapation is easily observed with a secondary ignition scope and I can tell you from thousands of observations that neither the activation voltage nor the burn time is changed by resistor plugs. The condition of the spark could change, but the premise of this discussion is the load on the module. It is my position that the module could care less.

I don't believe any of this affects modules as they only control the current through the primary which is determined by the primary resistance and the modules internal circuit design. MB uses current limitation by anticipated firing point. The only way to change the current is to increase the rate of current ramp.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician