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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Mechanical (Repair Instructions -- 2 Of 3) -- 4.8L, 5.3L & 6.0L) >> Repair Instructions (Off-Vehicle - Part 2) >> Intake Manifold Cleaning and Inspection >> Cleaning Procedure

Cleaning Procedure

WARNING: This page is about a different variant/trim than selected.
    IMPORTANT: Do not use the intake manifold-to-cylinder head sealing gaskets again.
  1. Remove the manifold absolute pressure (MAP) sensor (714) from the rear of the intake. The MAP sensor is to be reinstalled upon completion of the cleaning and inspection procedures.
  2. Inspect the sealing grommet on the MAP sensor. The grommet should not be torn or damaged.
    3. Fig 1: View Of MAP Sensor
    GM1277093Courtesy of GENERAL MOTORS CORP.
  3. Remove and discard the intake manifold-to-cylinder head gaskets (514).
    4. Fig 2: View Of Intake Manifold-To-Cylinder Head Gasket
    GM1277097Courtesy of GENERAL MOTORS CORP.
  4. Remove the fuel rail with injectors. Refer to Fuel Rail and Injectors Removal .
    5. Fig 3: View Of Fuel Rail W/Injectors
    GM1201536Courtesy of GENERAL MOTORS CORP.
  5. Remove the throttle body and gasket. Refer to Throttle Body Removal .
    6. Fig 4: View Of Throttle Body & Nuts
    GM825837Courtesy of GENERAL MOTORS CORP.
  6. Remove the evaporative emissions (EVAP) purge solenoid (708), bolt (710), and isolator (709).
    7. Fig 5: View Of EVAP Purge Solenoid, Bolt & Isolator
    GM1277094Courtesy of GENERAL MOTORS CORP.
  7. Clean the intake manifold in solvent.
    • Clean the intake manifold gasket surfaces.
    • Clean the intake manifold internal passages.
    8. CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
  8. Dry the intake manifold with compressed air.
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