Chevrolet Aveo 2009 Service Manual page 91

Document ID: 1456106
- Reduced ignition system voltage output
• Weak coils
• Worn ignition wires
• Incorrect spark plug gap
- Excessive idling or slow speeds under light loads can keep spark plug temperatures so low
that normal combustion deposits may not burn off.
• Deposit fouling--Oil, coolant, or additives that include substances such as silicone, very white
coating, reduces the spark intensity. Most powdery deposits will not effect spark intensity
unless they form into a glazing over the electrode.
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7/5/2010