Every 100 000 km (60,000 Miles)
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Remove and clean the CNG fill valve filter.
- Replace the spark plugs.
- Inspect the spark plug wires.
- Replace the in-line CNG filter.