Response:
COMPONENT TESTING
Fig. 1: A manifold vacuum gauge can be used to check the evaporative canister components
Canister Purge Regulator Valve
1) Disconnect the hoses at the purge regulator valve. Disconnect the electrical lead.
2) Connect a vacuum pump to the vacuum source port.
3) Apply 5 in. Hg (16.9 kPa) to the port. The valve should hold the vacuum. If not, replace it.
Canister Purge Valve
Apply vacuum to port A. The valve should hold vacuum. If not, replace it.
Apply vacuum to port B. Valves E5VE–AA, E4VE–AA and E77E–AA should show a slight vacuum leak-down. All other valves should hold vacuum. If the valve doesn't operate properly, replace it.
Apply 16 in. Hg (54 kPa) to port A and apply vacuum to port B. Air should pass. On valves E5VE–AA, E4VE–AA and E77E–AA, the flow should be greater than that noted in Step 2.
NOTE: Never apply vacuum to port C. Doing so will damage the valve.
If the valve fails to perform properly in any of these tests, replace it.
REMOVAL & INSTALLATION
Carbon Canister
Fig. 1: Remove the hoses, then unscrew the canister from its mounting
Disconnect the negative battery cable.
Label and disconnect the vapor hoses from the carbon canister.
Remove the canister attaching screws and remove the canister.
Installation is the reverse of the removal procedure.
Fuel Tank Vapor Orifice and Rollover Valve Assembly
Disconnect the negative battery cable.
Remove the fuel tank as described in Section 5.
Remove the vapor orifice and rollover valve assembly from the fuel tank.
Installation is the reverse of the removal procedure.
Purge Control Valve
Disconnect the negative battery cable.
Label and disconnect the hoses from the purge control valve.
Remove the purge control valve.
Installation is the reverse of the removal procedure.
Purge Solenoid Valve
Disconnect the negative battery cable.
Label and disconnect the hoses from the purge solenoid valve.
Disconnect the electrical connector from the valve.
Remove the purge solenoid valve.
Installation is the reverse of the removal procedure.
Fuel Bowl Solenoid Vent Valve
Disconnect the negative battery cable.
Label and disconnect the hoses from the fuel bowl solenoid vent valve.
Disconnect the electrical connector from the valve.
Remove the fuel bowl solenoid vent valve.
Installation is the reverse of the removal procedure.
Fuel Bowl Thermal Vent Valve
Disconnect the negative battery cable.
Label and disconnect the hoses from the fuel bowl thermal vent valve.
Remove the fuel bowl thermal vent valve.
Installation is the reverse of the removal procedure.
Pressure/Vacuum Relief Fuel Cap
Unscrew the fuel filler cap. The cap has a pre-vent feature that allows the tank to vent for the first 3⁄4 turn before unthreading.
Remove the screw retaining the fuel cap tether and remove the fuel cap.
Installation is the reverse of the removal procedure. When installing the cap, continue to turn clockwise until the ratchet mechanism gives off 3 or more loud clicks.
