Sierra 1500 2WD V6-4.3L VIN X (2004)
- Incorrect combustion
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Reduced ignition system voltage output
- Weak ignition coils
- Worn ignition wires
- Incorrect spark plug gap
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Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off.
3. Deposit fouling-Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark intensity.
Most powdery deposits will not affect spark intensity unless they form into a glazing over the electrode.