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6Y-10 ENGINE ELECTRICAL
CAUTION:
When connecting battery,
as in jump starting, reversing con-
nections or polarity can result in damge
to the electronic module .
POLE PIECE AND PLATE ASSEMBLY
The pole piece and plate assembly (often
referred to as the pick-up coil assembly) is
also serviced by complete replacement only .
Make certain the replacement assembly is the
correct part number. Early 1976 vehicles
contained a color-coded yellow plastic tie
around the pick-up coil leads; later 1976
vehicles contain pick-up coils with leads that
terminate in a yellow connector body that
attaches onto the module . The pole piece and
plate assembly should not be unnecessarily
dissembled as the polarity
of
the assembly
could be changed and affect proper operation
of the vehicle .
SPARK PLUG WIRES
Because of the higher voltage, the HEI
system has larger diameter (8 millimeter)
spark plug wires with silicone insulation . This
silicone wire is gray in color, more heat
resistant than standard black wire and less
vulnerable to deterioration . However, silicone
insulation is soft and very pliable, so that
scuffing and cutting is easier than on standard .
black wires . It is important that these more
pliable cables not be mishandled and that they
be routed correctly to prevent chafing or
cutting.
The silicone spark plug wire boots seal more
tightly to the spark plugs than ordinary boots.
Removal of boots from spark plugs must be
done with care. The old practice of pulling
them by the wires or with pliers will almost
always cause damage to the boot or wire joint.
It is recommended that the boot be twisted
about a half turn in either direction to break
the seal before pulling on the boot to remove
the wire .
The spark plug cable retainer is designed to
hold the wires firmly to prevent chafing or
cutting . The wires in the retainer cannot be
repositioned until
the
cable
retainer
is
unlocked . Any attempt to pull the spark plug
wires with the retainer in lock position could
result in damage to the plug wires. To unlock
the cable retainer, use a small screwdriver
between the tab and the lock .
To remove wiring - harness from cap, release
wiring harness from latch and remove wiring
harness, both right and left side .
The eight spark plug wires and holder are
replacable only as an assembly . However, if it
is necessary to remove an individual wire from
WARNING: DO NOT REMOVE SPARK PLUG
WIRES WITH
THE ENGINE
RUNNING. THE
HIGHER SECONDARY VOLTAGE IS CAPABLE
OF
JUMPING AN ARC OF GREATER DIS-
TANCE AND
COULD
CAUSE AN
ELECTRIC
SHOCK . OPERATING THE ENGINE WITH ONE
OR MORE SPARK PLUG WIRES DISCONNECTED
CAN ALSO RESULT IN DAMAGE TO THE DIS-
TRIBUTOR CAP .
Ohmmeter Test
1. Disconnect both ends of ignition cable
being tested and clean terminals .
2. Set ohmmeter on high scale and connect
ohmmeter to each end of cable being tested .
Twist cable gently while observing ohmmeter .
3 . If ohmmeter reads above 25,000 ohms or
fluctuates from infinity to any value, replace
cable being tested .
4. If the resistance of each cable is not
within the following bands, replace the cable
being tested : (for example)
0 to 15" cable - 3,000/10,000 ohms
15 to 25" cable - 4,000/15,000 ohms
25 to 35" cable - 6,000/25,000 ohms
Insulation Test
If the engine . periodically runs rough, stalls,
or won't start, the problem could be related to
precipitation, condensation,
or road splash
situation which coats the ignition system with
moisture . To determine if this
is
the trouble,
the following procedure can be used :
1 . Carefully remove the distributor spark
plug and coil wire retaining cap (hard hat)
from the distributor. Then remove the spark
plug and coil nipples from the retainer and
reconnect them to the distributor.
the wiring harness assembly, hold grommet of
wire down and press retainer tab out of wire
holder . To reinstall, lightly lubricate tab end
of spark plug wire with silicone . Rotate wire
until seated in holder .
CHECKING SPARK PLUG WIRES
Resistance
specifications
for both 7mm
wires used with standard systems and 8mm
wires used with HEI - systems are identical
(3,000 to 5,000 ohms per foot) . Inspect all
spark
plug
wires
for high resistance and
continuity with an ohmmeter .
NOTE : For proper operation, it is necessary
to keep ignition wires and distributor clean
and free of any dirt or corrosion .
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