Coil Pack

Coil packs come in four tower, six tower vertical connector, and six-tower horizontal connector models. Two adjacent coil towers share a common coil and are called a matched pair. For six-tower coil pack (six cylinder) applications the matched pairs are 1 and 5, 2 and 6, and 3 and 4 (Figure 53)and (Figure 54). For dual four-tower coil pack (eight cylinder) applications the matched pairs are 1 and 6, 3 and 5, 4 and 7, and 2 and 8 (Figure 55). For four-tower coil pack (four cylinder) applications the matched pairs are 1 and 4, and 2 and 3 (Figure 55).

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.

Figure 53: Vertical Connector Six Tower Coil Pack For Contour/mystique, 2.5L Cougar, 3.0L Taurus/Sable, Windstar, 3.8L Mustang and 3.0L Ranger, 4.2 E/F Series:

Figure 54 Horizontal Connector Six Tower Coil Pack For 4.0L Ranger, 4.0L Explorer, 4.0l SOHC Explorer/Mountaineer:

Figure 55: Four-Tower Coil Packs For Escort, Focus, 2.0L Cougar, 2.0L Contour/Mystique, 2.5L Ranger, 5.0L Explorer/Mountaineer: