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Spark Plug Wiring
There are a number of principles to wiring the spark plug leads to the coils, and a number of 'gotchas'.
* A single coil (two towers vertical when the connector is at the bottom) should fire cylinders that are 360° apart in the firing order. For example, if your firing order is 18436572, then 1&6, 8&5, 4&7, and 3&2 should be connected to the same coils (they are called 'complimentary cylinders).
* Do not confuse the firing order with the coil terminal numbering.
* Coil A fires 'first' (i.e., correct for cylinder #1), so it should be connected to cylinder #1 (and the complimentary cylinder). It doesn't matter which terminal on a coil goes to which of the two complimentary cylinders (since they both fire, the one on the exhaust stroke using vary little spark energy because of the ionized exhaust gases).
# 6 cylinder (EDIS6):
* On a 6 cylinder engine, the coils in a 6 terminal pack fire ACB (with ABC left to right with the connector on the bottom). Coil A fires first and should be connected to cylinder #1 and its complimentary cylinder. The coil C should be connected to the cylinder that fires after #1, and its complimentary cylinder. The remaining two cylinders should be connected to coil B.
* For example, with a 6 cylinder having a firing order of 123456 (GM 60° V6), you would connect coil A to 1&4, coil C to 2&5, coil B to 3&6.
* On EDIS6, coil A is connected to pin 10 of the EDIS module, coil B is connected to pin 11 of the EDIS module, and coil C is connected to pin 12 of the EDIS module. If these are connected the other way around, the coils will fire in a different order, and the spark plug wires will need to be rearranged.
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