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Ignition Control System Diagnostics
Before using the Ignition Control Diagnostic chart be sure to check the following items:
Spark plug wires:
Be sure spark plug wires are in good condition. Check for cuts, breaks, burns, hardness or swelling.
LPG fuel requires much higher peak firing voltages compared to gasoline. Check spark plug electrical
continuity using a DVOM. Wires should ohm out to no more than 1,000 ohms per foot of wire length.
Distributor cap and rotor:
Check the cap and rotor assembly for moisture, corrosion or carbon tracking. The ignition timing is not
adjustable. Turning the distributor assembly will not change the ignition timing, but will alter the rotor
phase. Wipe away dust and debris from the ignition coil tower.
System power fuses:
Check the system power fuses. These sources supply the ignition coil and module system power.
Check that the power and ground terminals are clean and in the proper location.
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