B4000 SE Cab Plus 4WD V6-4.0L OHV (1997)
Ignition Coil Pack: Description and Operation
COMPONENT
Ignition Coil
FUNCTION
A coil in a coil pack is turned on by PCM, then turned off, firing two spark plugs at once.
REMARKS
Spark plugs are paired so that as one spark plug fires on the compression stroke, the other spark plug fires on the exhaust stroke.
