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Home >> GMC >> 2003 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different car >> Section 497 (Engine Mechanical (Repair Instructions -- 1 Of 3) -- 4.8L, 5.3L & 6.0L) >> Repair Instructions (On-Vehicle & Off-Vehicle - Part 1) >> On-Vehicle Repair Instructions >> Valve Rocker Arm Cover Replacement - Left >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2004 GMC Yukon XL, 2004 GMC Yukon, 2004 Chevrolet Tahoe, 2004 Chevrolet Suburban, and 2004 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the engine sight shield, if required. Refer to Engine Sight Shield Replacement (4.8L, 5.3L, and 6.0L (RPO LQ4))  or Engine Sight Shield Replacement (6.0L (RPO LQ9)) .
  2. Remove the connector position assurance (CPA) lock.
  3. Disconnect the main electrical connector (2) to the ignition coil wire harness.
  4. Remove the harness clips (1).
  5. Reposition the engine harness, if necessary.
    6. Fig 1: View Of Main Ignition Coil Wire Harness Connector & Clips
    GM757686Courtesy of GENERAL MOTORS CORP.
  6. Remove the spark plug wires from the ignition coils.
    • Twist each plug wire 1/2 turn.
    • Pull only on the boot in order to remove the wire from the ignition coil.
  7. Remove the ignition coil bracket studs.
  8. Remove the ignition coil bracket.
    9. Fig 2: View Of Ignition Coil Bracket & Studs - Left
    GM832184Courtesy of GENERAL MOTORS CORP.
  9. Remove the positive crankcase ventilation (PCV) hose.
    10. Fig 3: View Of PCV Hose
    GM1201537Courtesy of GENERAL MOTORS CORP.
  10. Loosen the valve rocker arm cover bolts.
  11. Remove the valve rocker arm cover.
    12. Fig 4: View Of Valve Rocker Arm Cover - Left
    GM832209Courtesy of GENERAL MOTORS CORP.
  12. Remove and discard the old gasket (1).
    13. Fig 5: Rocker Arm Cover Gasket
    GM490696Courtesy of GENERAL MOTORS CORP.
  13. If required, clean and inspect the rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and Inspection .
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