Jeep 1996 Grand Cherokee Service Manual - page 284
REMOVAL AND INSTALLATION
SPARK PLUG CABLES
CAUTION:
When disconnecting a high voltage
cable from a spark plug or from the distributor cap,
twist the rubber boot slightly (1/2 turn) to break it
loose (Fig. 26). Grasp the boot (not the cable) and
pull it off with a steady, even force.
Install cables into the proper engine cylinder firing
order (Fig. 27) or (Fig. 28).
When replacing the spark plug and coil cables,
route the cables correctly and secure in the proper
retainers. Failure to route the cables properly can
cause the radio to reproduce ignition noise. It could
also cause cross ignition of the plugs or short circuit
the cables to ground.
When installing new cables, make sure a positive
connection is made. A snap should be felt when a
good connection is made between the plug cable and
the distributor cap tower.
SPARK PLUGS
On 5.2L V-8 engines, spark plug cable heat shields
are pressed into the cylinder head to surround each
cable boot and spark plug (Fig. 29).
If removal of the heat shield(s) is necessary,
remove the spark plug cable and compress the sides
of shield for removal. Each shield is slotted to allow
for compression and removal. To install the shields,
align shield to machined opening in cylinder head
and tap into place with a block of wood.
PLUG REMOVAL
(1) Always remove spark plug or ignition coil
cables by grasping at the cable boot (Fig. 26). 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.
Fig. 26 Cable Removal
Fig. 27 Engine Firing Order—4.0L 6–Cyl. Engine
Fig. 28 Engine Firing Order—5.2L V-8 Engine
Fig. 29 Heat Shields—5.2L Engines
ZJ
IGNITION SYSTEM
8D - 13