1997 Chevrolet Suburban Owner's Manual - Page 390
1997 Chevrolet Suburban Manual
Page 390 highlights
Long Tripmighway Maintenance Schedule-- Gasoline Enginc3 0Inspect engine accessory drivebelt. An Emission Control Service. 0Conduct Exhaust Gas Recirculation (EGR) system inspection as described in the service manual.An Emission Control Service. (See footnote?.) Cl Conduct evaporative control system inspection. Check all fuel and vapor lines and hoses for proper hook-up, routing and condition. Check that the purgevalve works properly, if equipped. Replace as needed. An Emission Control Service. (See footnote ?.) Replace fuel filter. An Emission Control Service. (See footnote?.) 0Inspect fuel tank,cap and lines for damage or leaks. Inspectfuel 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 damageor looseness. Adjust This is a Noise Emission or replace as required. Control Service. Applicable only to vehicles sold in the United States. 7-37