1997 GMC Suburban Owner's Manual - Page 393

Long Tripmighway Maintenance Schedule -- Gasoline Engines I 0Inspect engine accessory drive belt. An Emission Control Service. 0Conduct Exhaust Gas Recirculation (EGR) system inspection as described in the service manual. An Emission Control Service. (See footnote?.) 0Conduct 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 ?.) 0Replace fuel filter. An Emission Control Service. (See footnote?.) 0Inspect 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?.) 0Vehicles With GVWR Above 8,500 lbs. 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. DATE ACTUAL MILEAGE SERVICED B Y