There are a variety of implementations and a variety of side effects that occur with the different designs.
Some side effects are
altered combustion frequencies when diff cylinders fire resulting in shuddering and shaking
altered or bled off pressures to activate the systems that can result in partial starvation elsehwere
oil vacuum in dead holes resulting in both consumption issues then oil fouled plugs misfiring when reactivated
thermal issues with various configs running hot in areas and cold in others - fewer cylinders must work harder than all combined
trans calibration mismatches unde partial load resulting in surging confused shifting
accelerated motor mount wear from altered frequencies
expensive active motor mounts built to cancel out enhanced vibration
all in - its a tricky technology to master.
Im pretty pleased with the late Honda 2 mode VCM, but realize it was rough getting here.
The idea of wiring in a cheap resistor to fool the coolant logic to defeat it at this stage to me is utterly silly, but I understand prior hacks.
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