GMC Sierra 2000 Owner's Manual page 393

Long Trip/Highway Scheduled Maintenance
60,000 Miles (100 000 km) (Continued)
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7.4L Gasoline Engine on Complete Vehicle Over 14,000 GVWR and Chassis
Cabs Only: Inspect fuel tank, cap and lines for damage or leaks. Inspect fuel
cap gasket for any damage. Replace parts as needed.
An Emission Control Service. (See footnote
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Vehicles With GVWR Above 10,000 lbs. or Equipped with Diesel Engine
Only: Inspect shields and underhood insulation for damage or looseness.
Adjust or replace as required. This is a Noise Emission Control Service.
Applicable only to vehicles sold in the United States.
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If Equipped: Inspect Exhaust Gas Recirculation (EGR) system as described in
the service manual.
An Emission Control Service. (See footnote
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Gasoline Engine Only: Inspect Evaporative Control System. Check all fuel
and vapor lines and hoses for proper hook
that the purge valve works properly, if equipped. Replace as needed.
An Emission Control Service. (See footnote
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Diesel Engine Only: Check the air intake system installation to assure that
gaskets are properly sealed and that all hose connections, fasteners and other
components are tight. Also check to be sure that the air cleaner housing is
properly seated and the cover fits tightly. Tighten connections and fasteners or
replace damaged parts as necessary. This is a Noise Emission Control Service.
Applicable only to vehicles sold in the United States.
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