GM Service Manual Online
For 1990-2009 cars only

Evaporative Emission Control System Diagnosis Results of Incorrect Operation

    • Poor idle, stalling and poor driveability can be caused by:
       - Damaged canister
       - Hoses split, cracked, or not connected to the proper tubes
    • Evidence of fuel loss or fuel vapor odor can be caused by:
       - Liquid fuel leaking from the fuel lines
       - Cracked or damaged EVAP canister
       - Disconnected, misrouted, kinked, deteriorated or damaged EVAP pipe or canister hoses
       - Air cleaner or air cleaner gasket improperly seated

Evaporative Emission Control System Diagnosis Visual Check of EVAP Canister

    • Replace the EVAP canister if cracked or damaged.
    • Replace the EVAP canister if fuel is leaking from the bottom and then check the operation of the total system.