1997 GMC Sonoma Owner's Manual - Page 81

Parking Over Things That Burn Engine Exhaust Things that can burn could touch hot exhaust parts under yourvehicle and ignite. Don't park over papers,leaves, dry grass or other things that can burn. kill. It contains the gas Engine exhaust can carbon monoxide(CO),which you can't see or smell. It can cause unconsciousness and death. You might have exhaust coming in if: 0 Your exhaust system sounds strange or different. 0 Your vehicle getsrusty underneath. 0 Your vehicle was damaged in a collision. 0 Your vehicle was damaged when driving over high points on theroad or over road debris. 0 Repairs weren't done correctly. 0 Your vehicle or exhaust system had been modified improperly. If you ever suspect exhaust coming into is your vehicle: 0 Drive it only with all the windows down to blow out any CO; and Have your vehicle fixed immediately. 2-33