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WSG-1068 IGNITION SYSTEM
DIAGN0SIS AND TESTING
Service Adjustments And Checks
1. Each 400 hours of engine operation remove the
spark plugs and clean and adjust the electrode.
2. Clean and visually check each coil-on plug
connectors, check for secure fit.
Diagnostic Equipment
To accurately diagnose Coil on Plug (COP), certain
diagnostic equipment and tools are required. In addition,
the suggested diagnostic equipment may make the job
easier and more convenient.
Prior to diagnosing COP, obtain the following test
equipment or equivalent.
Spark tester, neon bulb type (Champion CT-
436).
Spark tester, gap type (special service tool
D81P-6666-A).
Connect this gap type spark tester between any COP
and engine ground to instantly determine if spark is
being provided to the plug. A spark plug with a broken
side electrode is not sufficient to check for spark and
may lead to incorrect results.
Volt-ohmmeter (Rotunda 73111 Automotive
Meter 105- R005 7 or equivalent).
A volt-ohmmeter is essential for gathering system
operating data during diagnosis, testing, and engine
servicing procedures. This digital volt ohmmeter (DVOM)
can also be used for general purpose electrical
troubleshooting on conventional starting and charging
systems.
CAUTION: There should be no wires spliced
to the main wire harness for source of power or RPM
signal unless pre-approved by Ford Power Products.
Otherwise, any alteration will void the warranty.
Altering of wire harness may cause lack of power,
no start, or erratic running.
NOTE: When using the spark plug firing indicator, place
the grooved end as close as possible to the plug boot.
Very weak or no flashing may be caused by a fouled
plug.
NOTE: Do not use an incandescent test lamp to check
CKPS- or CKPS+ circuits. The lamp will prevent the
circuit from operating.
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