GMC 2000 Savana - Manual (Page 365)

Long Trip/Highway Scheduled Maintenance
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j Vehicles With GVWR Above 10,000 lbs. or Equipped with Diesel Engine
Only: Inspect shields 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.
j If Equipped: Inspect Exhaust Gas Recirculation (EGR) system as described
in the service manual.
An Emission Control Service. (See footnote
[.)
j Gasoline Engine Only: Inspect Evaporative Control System. 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 Service. (See footnote
[.)
j 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.
(Continued)