Jeep Grand Cherokee WK. Manual — part 398
4.7L V-8 ENGINE
The 4.7L V-8 engine uses a separate ignition coil for each cylinder. The one-piece coil bolts directly to the cylinder
head. Rubber boots seal the secondary terminal ends of the coils to the top of all 8 spark plugs. A separate elec-
trical connector is used for each coil.
Because of coil design, spark plug cables (secondary cables) are not used. A distributor is not used with the 4.7L
engine.
Two knock sensors (one for each cylinder bank) are used to help control spark knock.
The Auto Shutdown (ASD) relay provides battery voltage to each ignition coil.
The ignition system consists of:
•
8 Spark Plugs
•
8 Separate Ignition Coils
•
2 Knock Sensors
•
Powertrain Control Module (PCM)
•
Also to be considered part of the ignition system are certain inputs from the Crankshaft Position, Camshaft
Position, Throttle Position, 2 knock and MAP Sensors
5.7L V-8 ENGINE
For additional information, also refer to Ignition
Coil Description and Operation.
The 5.7L V-8 engine is equipped with 16 spark plugs.
Two plugs are used for each cylinder. The 5.7L is also
equipped with 8 separate and independent ignition
coils. The one-piece coil bolts directly to the cylinder
head cover and attaches the coils secondary output
terminal directly to a spark plug using a rubber boot
seal. Each coil is also equipped with a second output
terminal. This second terminal connects a conven-
tional spark plug cable directly to a spark plug on the
opposite cylinder bank. A separate primary electrical
connector is used for each coil.
Eight conventional spark plug cables are used with the
5.7L. These cables connect a coil on one cylinder
bank, directly to a spark plug on the opposite cylinder
bank. The cables are placed and routed in a special
plastic loom to keep them separated. This loom is
clipped to the intake manifold. To prevent a miss-
match of cables, a corresponding spark plug / coil
number is displayed on each plug cable: 1/6, 2/3, 4/7
and 5/8. These numbers (2) and (3) can also be found
on the top of the intake manifold (1) to the right of the throttle body.
Two knock sensors (one for each cylinder bank) are used to help control spark knock.
The 5.7L engine will not use a conventional distributor.
The ignition system consists of:
•
16 Spark Plugs (2 per cylinder)
•
8 Separate, Dual-Secondary Output, Ignition Coils
•
2 Knock Sensors
•
8 Secondary Ignition Cables
•
Powertrain Control Module (PCM)
•
Also to be considered part of the ignition system are certain inputs from the Crankshaft Position, Camshaft
Position, Throttle Position, 2 knock and MAP Sensors
8I - 12
IGNITION SYSTEM - SERVICE INFORMATION
WK
SPECIFICATIONS
TORQUE - IGNITION
DESCRIPTION
N·m
Ft. Lbs.
In. Lbs.
Camshaft Position Sensor
- 3.7L V-6 Engine
12
-
106
Camshaft Position Sensor
- 4.7L V-8 Engine
12
-
106
Camshaft Position Sensor
- 5.7L V-8 Engine
12
9
105
Crankshaft Position
Sensor - 3.7L V-6 Engine
28
21
205
Crankshaft Position
Sensor - 4.7L V-8 Engine
28
21
205
Crankshaft Position
Sensor - 5.7L V-8 Engine
12
9
105
Ignition Coil Mounting -
3.7L V-6 Engine
8
-
70
Ignition Coil Mounting -
4.7L V-8 Engine
8
-
70
Ignition Coil Mounting -
5.7L V-8 Engine
12
9
105 (± 20)
* Knock Sensor - 3.7L V-6
Engine
20
15
176
* Knock Sensor - 4.7L V-8
Engine
20
15
176
* Knock Sensor - 5.7L V-8
Engine
20
15
176
Spark Plugs - 3.7L V-6
Engine
27
20
-
Spark Plugs - 4.7L V-8
Engine
27
20
-
** Spark Plugs - 5.7L V-8
Engine
18 (± 3)
13 (± 2)
-
* Do not apply any
sealant, thread-locker or
adhesive to bolts. Poor
sensor performance may
result.
** Torque critical tapered
design. Do not exceed 15
ft. lbs.
ENGINE FIRING ORDER - 3.7L V-6
1 - 6 - 5 - 4 - 3 - 2
WK
IGNITION SYSTEM - SERVICE INFORMATION
8I - 13
ENGINE FIRING ORDER – 4.7L V-8
FIRING ORDER / CABLE ROUTING – 5.7L V-8 ENGINE
Eight conventional spark plug cables are used with the
5.7L. These cables connect a coil on one cylinder
bank, directly to a spark plug on the opposite cylinder
bank. The cables are placed and routed in a special
plastic loom to keep them separated. This loom is
clipped to the intake manifold. To prevent a miss-
match of cables, a corresponding spark plug / coil
number is displayed on each plug cable: 1/6, 2/3, 4/7
and 5/8. These numbers (2) and (3) can also be found
on the top of the intake manifold (1) to the right of the
throttle body.
8I - 14
IGNITION SYSTEM - SERVICE INFORMATION
WK
SPARK PLUG CABLE RESISTANCE
MINIMUM
MAXIMUM
250 Ohms Per Inch
1000 Ohms Per Inch
3000 Ohms Per Foot
12,000 Ohms Per Foot
SPARK PLUGS
ENGINE
PLUG TYPE
ELECTRODE GAP
3.7L V-6
ZFR6F - 11G (NGK)
1.1 (0.042 in.)
4.7L V-8
RC12MCC4
1.01 mm (.040 in.)
5.7L V-8
Champion - RE14MCC4
1.14 mm (.045 in.)
IGNITION COIL RESISTANCE - 3.7L V-6
PRIMARY RESISTANCE
21-27°C (70-80°F)
SECONDARY
RESISTANCE 21-27°C
(70-80°F)
0.6 - 0.9 Ohms
6,000 - 9,000 Ohms
IGNITION COIL RESISTANCE - 4.7L V-8
PRIMARY
RESISTANCE 21-27°C
(70-80°F)
SECONDARY
RESISTANCE 21-27°C
(70-80°F)
0.6 - 0.9 Ohms
6,000 - 9,000 Ohms
IGNITION COIL RESISTANCE - 5.7L V-8
PRIMARY RESISTANCE @ 21-27°C (70-80°F)
0.558 - 0.682 Ohms
(Plus or Minus 10% @ 70-80° F)
IGNITION TIMING
Ignition timing is not adjustable on any engine.
RELAY-AUTO SHUT DOWN
DESCRIPTION - PCM OUTPUT
The 5–pin, 12–volt, Automatic Shutdown (ASD) relay is located in the Power Distribution Center (PDC). Refer to
label on PDC cover for relay location.
WK
IGNITION SYSTEM - SERVICE INFORMATION
8I - 15
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