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4.7L V-8 Engine: Each individual spark plug is
located under each ignition coil. Each individual igni-tion
coil must be removed to gain access to each spark
plug. Refer to Ignition Coil Removal/Installation.
(1) Except 4.7L Engine: Prior to removing spark
plug, spray compressed air around spark plug hole
and area around spark plug. This will help prevent
foreign material from entering combustion chamber.
(2) 4.7L V-8 Engine: Prior to removing spark plug,
spray compressed air around base of ignition coil at
cylinder head. This will help prevent foreign material
from entering combustion chamber.
(3) Remove spark plug from cylinder head using a
quality socket with a rubber or foam insert. If
equipped with a 4.7L V-8 engine, also check condition
of coil o-ring and replace as necessary.
(4) Except 4.7L: Always remove spark plug or igni-tion
coil cables by grasping at the cable boot (Fig.
37). Turn the cable boot 1/2 turn and pull straight
back in a steady motion. Never pull directly on the
cable. Internal damage to cable will result.
(5) Inspect spark plug condition. Refer to Spark
The plugs may be cleaned using commercially
available spark plug cleaning equipment. After clean-ing,
file center electrode flat with a small point file or
jewelers file before adjusting gap.
CAUTION: Never use a motorized wire wheel brush
to clean spark plugs. Metallic deposits will remain
on spark plug insulator and will cause plug misfire.
CAUTION: The 4.7L V-8 engine is equipped with
copper core ground electrode spark plugs. They
must be replaced with the same type/number spark
plug as the original. If another spark plug is substi-tuted,
pre-ignition will result.
Special care should be taken when installing spark
plugs into the cylinder head spark plug wells. Be
sure the plugs do not drop into the plug wells as elec-trodes
can be damaged.
Always tighten spark plugs to the specified torque.
Over tightening can cause distortion resulting in a
change in the spark plug gap or a cracked porcelain
Except 4.7L Engine: When replacing the spark plug
and ignition coil cables, route the cables correctly and
secure them in the appropriate retainers. Failure to
route the cables properly can cause the radio to repro-duce
ignition noise. It could cause cross ignition of the
spark plugs or short circuit the cables to ground.
(1) Start the spark plug into the cylinder head by
hand to avoid cross threading.
(2) Except 4.7L Engine: Tighten spark plugs to
35-41 N·m (26-30 ft. lbs.) torque.
(3) Except 4.7L Engine: Install spark plug cables
over spark plugs.
(4) 4.7L V-8 Engine: Tighten spark plugs to 27
N·m (20 ft. lbs.) torque.
(5) 4.7L V-8 Engine: Before installing coil(s), check
condition of coil o-ring and replace as necessary. To aid
in coil installation, apply silicone to coil o-ring.
(6) 4.7L V-8 Engine: Install ignition coil(s). Refer
to Ignition Coil Removal/Installation.
SPARK PLUG CABLE
Spark plug cables are sometimes referred to as sec-ondary
The spark plug cables transfer electrical current
from the ignition coil(s) and/or distributor, to individ-ual
spark plugs at each cylinder. The resistive spark
plug cables are of nonmetallic construction. The
cables provide suppression of radio frequency emis-sions
from the ignition system.
DIAGNOSIS AND TESTING - SPARK PLUG
Check the spark plug cable connections for good
contact at the coil(s), distributor cap towers, and
spark plugs. Terminals should be fully seated. The
insulators should be in good condition and should fit
tightly on the coil, distributor and spark plugs. Spark
plug cables with insulators that are cracked or torn
must be replaced.
Clean high voltage ignition cables with a cloth
moistened with a non-flammable solvent. Wipe the
cables dry. Check for brittle or cracked insulation.
On 3.9L V-6 and 5.2/5.9L V-8 engines, spark plug
cable heat shields are pressed into the cylinder head
to surround each spark plug cable boot and spark
plug (Fig. 36). These shields protect the spark plug
boots from damage (due to intense engine heat gen-erated
by the exhaust manifolds) and should not be
removed. After the spark plug cable has been
installed, the lip of the cable boot should have a
small air gap to the top of the heat shield (Fig. 36).
When testing secondary cables for damage with an
oscilloscope, follow the instructions of the equipment
If an oscilloscope is not available, spark plug cables
may be tested as follows:
CAUTION: Do not leave any one spark plug cable
disconnected for longer than necessary during test-ing.
This may cause possible heat damage to the
catalytic converter. Total test time must not exceed
With the engine running, remove spark plug cable
from spark plug (one at a time) and hold next to a
good engine ground. If the cable and spark plug are
in good condition, the engine rpm should drop and
the engine will run poorly. If engine rpm does not
drop, the cable and/or spark plug may not be operat-ing
properly and should be replaced. Also check
engine cylinder compression.
With the engine not running, connect one end of a
test probe to a good ground. Start the engine and run
the other end of the test probe along the entire
length of all spark plug cables. If cables are cracked
or punctured, there will be a noticeable spark jump
from the damaged area to the test probe. The cable
running from the ignition coil to the distributor cap
can be checked in the same manner. Cracked, dam-aged
or faulty cables should be replaced with resis-tance
type cable. This can be identified by the words
ELECTRONIC SUPPRESSION printed on the cable
Use an ohmmeter to test for open circuits, exces-sive
resistance or loose terminals. If equipped,
remove the distributor cap from the distributor. Do
not remove cables from cap. Remove cable from
spark plug. Connect ohmmeter to spark plug termi-nal
end of cable and to corresponding electrode in
distributor cap. Resistance should be 250 to 1000
Ohms per inch of cable. If not, remove cable from dis-tributor
cap tower and connect ohmmeter to the ter-minal
ends of cable. If resistance is not within
specifications as found in the SPARK PLUG CABLE
RESISTANCE chart, replace the cable. Test all spark
plug cables in this manner.
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