GMC SIERRA 1998 Manual page 404

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Lono Tripmighway Maintenance Schedule
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Gasoline Engines
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,000 Miles (100 000 km) (Continued)
An Emission Control Service.
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Inspect engine accessory drive belt.
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Replace fuel filter. An Em.issiorz Control Service. (See footnote?.)
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Inspect fuel tank, c.ap and lines for damage or leaks. inspect fuel cap gasket
for any damage. Replace parts as needed.
An Emission Control Service. (See footnote?.)
insulation for damage or looseness. Adjust or replace as required.
This is a Noise Emission Control Service. Applical?lc) only to vehicles
sold in the United States.
the service manual.
An Emission Control Service. (See footnote?.)
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Conduct evaporative control system inspection. Check all fuel and vapor lines
and hoses for proper hook-up, routing and condition. Check that the purge
valve works properly, if equipped. Replace as needed.
An Emission Control Sen,ic:e. (See footnote?.)
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Vehicles With GVWR Above 8,500 lbs. Only: Inspect shields and underhood
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Conduct Exhaust Gas Recirculation (EGR) system inspection as described in
7-34