4A - 8 Distributor Ignition 5.0/5.7L
MEFI 4 - PCM
Spark Plug Wire Inspection
Spark plug wire integrity is vital for proper engine
operation. A thorough inspection will be necessary to
accurately identify conditions that may affect engine
operation. Inspect for the following conditions:
1. Correct routing of the spark plug wires. Incorrect
routing may cause cross-fi ring.
2. Any signs of cracks or splits in the wires.
3. Inspect each boot for the following conditions:
• Tearing
• Piercing
• Arcing
• Carbon tracking
• Corroded terminal
If corrosion, carbon tracking or arcing are indicated on a
spark plug wire boot or on a terminal, replace the wire and
the component connected to the wire.
Installation Procedure
1. Install the spark plug wire at the correct distributor
tower.
2. Install the spark plug wire at the correct spark plug.
3. Inspect the wires for proper installation:
3.1. Push sideways on each boot in order to inspect
the seating.
3.2. Reinstall any loose boot.
M4094
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