Spark Plug - Dodge Dakota Sport 2001 Service Manual

8I - 16 IGNITION CONTROL
IGNITION COIL (Continued)
Fig. 27 Ignition Coil Location—4.7L V–8 Engine
1 - IGNITION COIL
2 - COIL ELECTRICAL CONNECTOR
3 - COIL MOUNTING STUD/NUT
INSTALLATION - 3.9L/5.2L/5.9L
The ignition coil is an epoxy filled type. If the coil
is replaced, it must be replaced with the same type.
(1) Install the ignition coil to coil bracket. If nuts
and bolts are used to secure coil to coil bracket,
tighten to 11 N·m (100 in. lbs.) torque. If the coil
mounting bracket has been tapped for coil mounting
bolts, tighten bolts to 5 N·m (50 in. lbs.) torque.
(2) Connect all wiring to ignition coil.
INSTALLATION - 4.7L
(1) Using compressed air, blow out any dirt or con-
taminants from around top of spark plug.
(2) Check condition of coil o-ring and replace as
necessary. To aid in coil installation, apply silicone to
coil o-ring.
(3) Position ignition coil into cylinder head opening
and push onto spark plug. Do this while guiding coil
base over mounting stud.
(4) Install mounting stud nut and tighten to 8 N·m
(70 in. lbs.) torque.
(5) Connect electrical connector to coil by snapping
into position.
(6) If necessary, install throttle body air tube or
box.

SPARK PLUG

DESCRIPTION
All engines use resistor type spark plugs. 4.7L V-8
engines are equipped with "fired in suppressor seal"
type spark plugs using a copper core ground elec-
trode.
Because of the use of an aluminum cylinder head
on the 4.7L engine, spark plug torque is very critical.
To prevent possible pre-ignition and/or mechanical
engine damage, the correct type/heat range/number
spark plug must be used.
OPERATION
Remove the spark plugs and examine them for
burned electrodes and fouled, cracked or broken por-
celain insulators. Keep plugs arranged in the order
in which they were removed from the engine. A sin-
gle plug displaying an abnormal condition indicates
that a problem exists in the corresponding cylinder.
Replace spark plugs at the intervals recommended in
Lubrication and Maintenance.
Spark plugs that have low mileage may be cleaned
and reused if not otherwise defective, carbon or oil
fouled. Also refer to Spark Plug Conditions.
CAUTION: Never use a motorized wire wheel brush
to clean the spark plugs. Metallic deposits will
remain on the spark plug insulator and will cause
plug misfire.
DIAGNOSIS AND TESTING - SPARK PLUG
CONDITIONS
NORMAL OPERATING
The few deposits present on the spark plug will
probably be light tan or slightly gray in color. This is
evident with most grades of commercial gasoline
(Fig. 28). There will not be evidence of electrode
burning. On all engines except the 4.7L V-8, gap
growth will not average more than approximately
0.025 mm (.001 in) per 3200 km (2000 miles) of oper-
ation. On the 4.7L V-8, gap growth will not average
more than approximately .0015 in per 3200 km (2000
miles) of operation. Spark plugs that have normal
wear can usually be cleaned, have the electrodes
filed, have the gap set and then be installed.
AN