RE: misfire in cyl 1,3,5
Expound forthcoming:
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Ignition Coil Packs
Each ignition coil pack contains two separate ignition coils which
are controlled by the ignition control module through two coil leads.
Each ignition coil fires two spark plugs simultaneously; one plug on
the compression stroke and one on the exhaust stroke. The majority of
the energy is used by the spark plug on the compression stroke. The
spark plug fired on the exhaust stroke uses very little of the
ignition coil's stored energy. Since these two spark plugs are
connected in series, the firing voltage of one plug will be negative
with respect to ground, while the voltage of the other will be
positive with respect to ground. Refer to the «Powertrain
Control/Emissions Diagnosis Manual» for additional information on
spark plug polarity.
NOTE:
The numbers on the coil tower terminals shown in the following
illustration are engine cylinder numbers. These numbers are shown for
information only and are not shown on towers. Actual identification
labels are shown in View A. The spark plug wire attached to a
particular tower should be attached at the other end to the spark
plug for the same numbered cylinder.
The RH coil pack is mounted on a bracket attached to the front cover.
The LH coil pack is mounted on the coil/power steering reservoir
bracket attached to the front cover. There are two cylinder numbers
on each coil terminal to allow the coil packs to be interchangeable.
http://mark8.org/users/driller/pics/coils.jpg
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Note the 3 pin harness plug on each coil. On the right coil pack,
pins 1 to 3 are coil 2, battery, and coil 1. On the left coil pack,
pins 1 to 3 are coil 4, battery, and coil 3.
Check and clean
these electrical harness connectors. Make sure they fit snugly
and use electrical contact cleaner on the pins in the coil packs and
sockets of the wire plugs.
Expound complete.