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Home >> Chevrolet >> 2009 >> Uplander Base, 3.9 1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - Introduction (2 Of 2) >> Repair Instructions >> Spark Plug Replacement >> Installation Procedure
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Installation Procedure

    Fig 1: Identifying Spark Plugs
    GM1587748Courtesy of GENERAL MOTORS CORP.
    CAUTION: It is important to check the gap of all new and reconditioned spark plugs before installation. Pre-set gaps may have changed during handling. Use a round wire feeler gauge to be sure of an accurate check, particularly on used plugs. Installing plugs with the wrong gap can cause poor engine performance and may even damage the engine.
  1. Gap the NEW spark plugs. Refer to Ignition System Specifications .
    2. CAUTION: Refer to Fastener Caution .
  2. Install the spark plugs and tighten to 15 N.m (11 lb ft)  .
    3. Fig 2: View Of Spark Plug Wire Assembly
    GM1582938Courtesy of GENERAL MOTORS CORP.
  3. Install the right side spark plug wires to the spark plugs, if required.
  4. Rotate the engine to the original position. Refer to Rotating the Engine for Service Access .
    5. Fig 3: View Of Left Spark Plug/Coil Harness
    GM1582091Courtesy of GENERAL MOTORS CORP.
  5. Install the left side spark plug wires to the spark plugs.
  6. Install the intake manifold cover, if required. Refer to Intake Manifold Cover Replacement .
  7. Install the air cleaner outlet duct, if required. Refer to Air Cleaner Outlet Duct Replacement .
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