widening the gap to 1/4-3/8".
Disconnect spark plug wire
and insert test plug. Ground
plug, crank engine, and
check for spark.
GOOD SPARK
NO SPARK
* If plug sparks, driveability
* Remove coil wire from the
problem is most likely NOT
distributor and attach the
in the ignition system.
modified spark plug. Ground
the plug and crank engine
while checking for spark.
GOOD SPARK
NO SPARK
* If plug has a good spark,
* Proceed to the IGNITION
the problem is in the plug
PRIMARY TROUBLE SHOOTING
wires, distributor cap, or
CHECK CHART below in this
rotor. Replace components
article.
as necessary.
Ignition Primary Trouble Shooting Chart
START: Visually inspect primary ignition wires for
broken, frayed, split, or cut wires. Also check
for loose, corroded, or disconnected connectors.
OK
NOT OK
* Check that battery voltage
* Repair or replace damaged
is at least 11.5 volts.
components as necessary.
NOT OK
OK
* Replace or recharge the
* Check for battery voltage
battery.
at the positive terminal of
the coil.
OK
NOT OK
* Check air Gap of the Pick-Up
* Check resistance of ballast
coil in the distributor.
resistor (if used) for the
correct resistance value.
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