Sierra 1500 4WD V6-4.3L (2008)
Ignition Cable: Testing and Inspection
Spark Plug Wire Inspection
Spark plug wire integrity is vital for proper engine operation. A thorough inspection is 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-firing.
2. Any signs of cracks or splits in the wires.
3. Inspect each boot for the following conditions:
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Tearing
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Piercing
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Arcing
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Corroded terminal
If corrosion, or arcing are indicated on a spark plug wire boot a terminal, replace the wire and inspect the components connected to the wire.