1998 GMC Savana Van Owner's Manual - Page 345

Long Trir'Highway Maintenance Schedule . GasolineEngines I Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 0 Inspect engine accessory drive belt. An Emission Control Service. 0 Replace fuel filter. An Ernission Control Service. (See footnote?.) 0 Replace air cleaner filter. An Emission Control Service. 0 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"f) 0 Vehicles With GVWR Above 8,500 lbs. Only: Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This isa Noise Emission Control Service. Applicable only to vehicles sold in the United States. Conduct Exhaust Gas Recirculation (EGR) system inspection as described in the service manual. An Emission Control Service. (See footnote?.) 0 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 Service. (See footnote?.) 7-33