Contour L4-122 2.0L CNG DOHC VIN Z SFI (1996)
Ignition Coil: Description and Operation
The ignition coil contains separate ignition coils which are controlled by the Powertrain Control Module (PCM) through two coil leads. Each coil fires
two spark plugs simultaneously:
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One spark plug on the compression stroke. This spark plug uses the majority of the ignition coil energy.
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One spark plug on the exhaust stroke. This spark plug uses very little of the ignition coil stored energy.
Since these two spark plugs are connected in series, the firing voltage of one spark plug will be negative with respect to ground, and the other spark plug
will be positive with respect to ground.
