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E M U S
ENGINE TUNE-UP PROCEDURES
Spark Plug and Ignition Coil Wires
To remove the wires from the spark plugs, twist
the rubber protector boot approximately 1/2 turn
to break the seal.
Grasp the boot and pull it away from the plug
with a constant force.
Do not pull on the wire itself because this will
damage the conductor and terminal connection.
To remove the wires from the distributor cap or
ignition coil tower, loosen the boot first, then
grasp the upper part of the boot and the wire and
gently pull straight up.
Spark Plug Wire Test
Do not puncture the spark plug wires with a
probe while performing any test. This may cause
a separation in the conductor.
T h e preferred method is to remove the
suspected wire and use an ohmmeter to
determine if the resistance is correct for the
length of the particular wire.
R e f e r to the S p a r k Plug and Coil Wire
Resistance Values chart.
Spark Plug and Coil Wire Resistance Values
C m (Inches)
Ohms
0-38 (0-15)
38-63 (15-25)
63-90 (25-35)
over 90 (Over 35)
3,000-10,000
4,000-15,000
6,000-20,000
8,000-25,000
840113
When installing the spark plug wires and the
ignition coil high voltage wire, ensure that
mechanically tight connections are made at the
spark plugs, distributor cap towers and ignition
coil tower.
The wire protector boots at the spark plugs,
distributor cap towers and coil tower must also fit
tightly.
A partially seated wire terminal creates an air
separation (resistance) in the high voltage
circuit and the resulting arcing will c a u s e
terminal corrosion and wire conductor damage.
When replacing spark plug wires, route the
wires correctly and secure them within the
proper retainers.
Failure to route the wires properly can result in
radio ignition noise and cross ignition of the
plugs, or short circuit the wires to ground.
B - 2 §
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Troubleshooting
