How to Troubleshoot a 2002 Chevy Avalanche
- 1). Locate the oxygen sensor of your Avalanche if you smell a sulfur odor coming from the truck's exhaust while the engine is idling. The sensor may be damaged or faulty. You should also inspect the catalytic converter to see if it is faulty or has become clogged. The coolant temperature sensor and MAP sensor may also be disconnected or damaged. If the problem still persists after inspecting these different parts, check the carburetor to see if it has been adjusted incorrectly and check the PCV valve to make sure it isn't clogged.
- 2). Inspect the head engine gasket and valve stem seals if your truck emits a lot of smoke right after you start the engine. The gasket could be leaking antifreeze or coolant into the engine's cylinders and the stem seals may be damaged or inoperable.
- 3). Find the heater core on your Avalanche if the passenger compartment smells musty. Make sure that the heater core is not releasing antifreeze into the floor area of the truck.
- 4). Check the piston ring set and head gasket when the truck's exhaust smells like burning oil while you drive. One or more pistons on the ring set may be worn out or broken and the head gasket may be leaking and damaged.
- 5). Examine the engine's belts and battery cables when the truck emits a burning rubber smell while the engine is either idling or driving. One or more of the belts may be missing, broken, improperly routed or improperly adjusted. The battery cables could be broken, corroded or poorly connected.