Direct Ignition or Coil On Plug (COP) Ignition Systems

     A Direct Ignition system has coil for each spark plug. Usually the coils are mounted directly on top of the spark plugs with no HT leads. This ignition system is so far the best of all, as it have no moving parts or high voltage HT leads or rotor, distributor and cap and so on. The ignition timing can and is adjusted for each cylinder individually. On some models the coil and the ignition module are together on top of the spark plug. The disadvantage is that in most instances special HT adaptors are needed to diagnose those ignition systems.

 

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