Important: Use compressed natural gas (CNG) that meets
the specifications of SAE J1616. These specifications place limits on particulate
contamination and moisture content. CNG that meets these specifications provides improved
driveability and emission control system performance. CNG that does not meet these
specifications may cause fuel system or engine damage. If your GM dealer determines
that the cause of the condition is the type of CNG used, repairs may not be covered
under warranty.
This schedule information is supplemental to the gasoline service manual information.
Refer to the J Platform Service Manual for additional maintenance items.
The services shown in this schedule up to 193 000 km (120,000 miles)
should be performed after 19 000 km (120,000 miles)
at the same intervals.
Every 12 500 km (7,500 Miles)
| • | Inspect the CNG fuel lines and the fittings for leaks. |
| • | Inspect the CNG fill valve O-ring. |
| • | Inspect the CNG fill valve filter. |
Every 24 000 km (15,000 Miles)
Drain the fluids from the in-line CNG filter housing.
Every 100 000 km (60,000 Miles)
| • | Remove and clean the CNG fill valve filter. |
| • | Replace the spark plugs. |
| • | Inspect the spark plug wires. |
| • | Replace the in-line CNG filter. |
Every 200 000 km (120,000 Miles)
Replace the high pressure regulator (HPR) filter.
Maintenance Schedule Example
Normal Vehicle Use
These schedules are for vehicles that:
| • | Carry passengers and cargo within recommended limits. These limits
are listed on the vehicles tire loading information label located on the
driver door. |
| • | Are driven on reasonable road surfaces within legal driving limits. |
| • | Use unleaded gasoline of the recommended type. For information
on the proper type of fuel to use, refer to the Owner's Manual. |
Selecting the Right Schedule
Determine which of the two schedules is right for your vehicle. Refer
to the definitions of maintenance schedules below.
Important: Additional maintenance recommendations are in this subsection. Also
refer to
Owner Checks and Services
,
Periodic Maintenance Inspection
.
Short Trip/City Maintenance Definition
Refer to
Maintenance Schedule - Short Trip/City
if any one of these conditions is true for your vehicle:
| • | Most trips are less than 8 to 16 km (5 to 10 mi).
This is particularly important when outside temperatures are below freezing. |
| • | Most trips include extensive idling such as frequent driving in
stop-and-go traffic. |
| • | Most trips are through dusty areas. |
| • | A trailer is frequently towed, or a carrier is used on top of
the vehicle. |
| • | If the vehicle is used for delivery service, police, taxi or other
commercial application. |
Long Trip/Highway Maintenance Definition
Refer to
Maintenance Schedule - Long Trip/Highway
only if none of the conditions from the Short Trip/City Maintenance
Schedule is true.
