Hummer H2. Manual — part 1468

Fig. 150: Chassis Fuel Feed Hose & Fuel Filter
Courtesy of GENERAL MOTORS CORP.

1. Install the EVAP canister to the vehicle.

2. Connect EVAP solenoid electrical connector.

3. Install the EVAP canister mounting bolts.

Tighten: Tighten the bolts to 25 N.m (18 lb ft).

NOTE:

Refer to Fastener Notice in Cautions and Notices.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 151: Vent Pipe & EVAP Canister Vent Valve Electrical Connector
Courtesy of GENERAL MOTORS CORP.

4. Connect the pipes to the EVAP canister.

5. Lower the vehicle.

EVAPORATIVE EMISSION (EVAP) SYSTEM CLEANING

Tools Required

J 41413-200 Evaporative Emission System Tester (EEST). See Special Tools and Equipment .

Inspection Procedure

NOTE:

Use the Evaporative Emissions System Tester (EEST) J41413-200 in order to

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

1. Turn OFF the ignition.

2. Remove the EVAP canister purge solenoid valve. Refer to Evaporative Emission (EVAP) Canister

Purge Solenoid Valve Replacement .

3. Lightly tap the EVAP canister purge solenoid valve on a clean hard surface.

4. Inspect for carbon particles exiting either of the vacuum ports.

z

If no carbon particles are found reinstall the EVAP canister purge solenoid valve and continue with
the EVAP cleaning procedure. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid
Valve Replacement .

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If carbon particles are found during the inspection procedure, replace the EVAP canister purge
solenoid valve and continue with the EVAP cleaning procedure. Refer to Evaporative Emission
(EVAP) Canister Purge Solenoid Valve Replacement .

z

If you were instructed to replace the EVAP canister purge solenoid valve, and no carbon particles
are found, return to the EVAP diagnostic procedure. Do not perform the EVAP cleaning procedure.

EVAP Cleaning Procedure

1. Remove the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .

2. Turn OFF the main valve on the J 41413-200 . See Special Tools and Equipment .

3. Disconnect the hose from the diagnostic station pressure regulator.

4. Using a section of vacuum hose, connect one end to the diagnostic station pressure regulator.

5. Connect the other end of the vacuum hose to the canister side of the purge pipe.

6. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.

7. If the nitrogen does not dislodge the carbon particles, replace the purge pipe. Refer to Evaporative

Emission (EVAP) System Hoses/Pipes Replacement (Engine Compartment EVAP Pipe) or
Evaporative Emission (EVAP) System Hoses/Pipes Replacement (Chassis EVAP Pipe) or
Evaporative Emission (EVAP) System Hoses/Pipes Replacement (EVAP Vent Pipe) or Evaporative
Emission (EVAP) System Hoses/Pipes Replacement (Rear EVAP Fuel Tank Pipe) .

8. Return the EVAP pressure/purge diagnostic station to the tools original condition.

9. Install a new EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .

10. Connect all previously disconnected EVAP pipe connectors.

11. Lower the vehicle.

12. Continue with the published service manual diagnostic DTC procedure.

IGNITION COIL(S) REPLACEMENT

Removal Procedure

provide a clean, dry, low pressure gas source. Do not substitute any other
pressurized gas source. Damage may result to the EVAP system.

IMPORTANT: Do not perform this procedure unless instructed by an EVAP diagnostic.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 152: Spark Plug Wires & Ignition Coils
Courtesy of GENERAL MOTORS CORP.

1. Disconnect the spark plug wires at the ignition coils.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2