B3000 SE Cab Plus 4 4WD V6-3.0L OHV (2000)
cylinder) applications the matched pairs are 1 and 4, and 2 and 3. When the coil is fired by the PCM, spark is delivered through the matched pair
towers to their respective spark plugs. The spark plugs are fired simultaneously and are paired so that as one fires on the compression stroke, the
other spark plug fires on the exhaust stroke. The next time the coil is fired the situation is reversed. The next pair of spark plugs fire according to
the engine firing order.