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Intake Manifold Cleaning and Inspection (LAU or LBW)

Intake Manifold Cleaning and Inspection (LAU or LBW)

Upper Intake Manifold Cleaning Procedure


1. Remove any remaining gasket and/or gasket material from the following:

• Throttle Body

• Intake manifold

2. Clean the following intake manifold areas in solvent.

• Intake manifold gasket sealing areas

• Intake manifold passages

• Brake booster hose passage

• Evaporative emission (EVAP) solenoid passage

• Positive crankcase ventilation (PCV) vacuum hose passages

• Manifold absolute pressure (MAP) sensor passage

3.
Warning

Wear safety glasses when using compressed air, as flying dirt particles may cause eye injury.


Dry the upper intake manifold and throttle body with compressed air.


Inspection Procedure


1. Inspect the upper intake manifold for the following conditions:


• Damage to the intake manifold bolt bosses (2)

• Damage to the component bolt bosses and threads (1)

• Damage, debris or restrictions to the brake vacuum booster hose port (4)

• Damage, debris or restrictions to the PCV system hose ports (3)

• Damage, debris or restrictions to the EVAP system hose ports (5)

• Damage to the throttle body bolt holes

2. Inspect the upper intake manifold for the following conditions:


• Gouges or damage to the upper intake manifold sealing surfaces (1)

• Damage to the gasket sealing surface (2) for the throttle body

3. Inspect the upper intake manifold sealing surface for warpage.


3.1. Locate a straight edge across the upper-to-lower intake manifold sealing surface.

3.2. Insert a feeler gauge between the upper intake manifold and the straight edge. An upper intake manifold with warpage in excess of 0.50 mm (0.020 in) must be replaced.

4. Repair or replace the upper intake manifold as necessary.


Lower Intake Manifold Cleaning Procedure


1. Remove any remaining gasket and/or gasket material from the following:

• Upper-to-lower intake manifold sealing surface

• Cylinder head-to-lower intake manifold sealing surface

2. Clean the following intake manifold areas in solvent.

• Intake manifold gasket sealing areas

• Intake manifold passages

3.
Warning

Wear safety glasses when using compressed air, as flying dirt particles may cause eye injury.


Dry the intake manifold with compressed air.


Inspection Procedure


1. Inspect the lower intake manifold for the following conditions:


• Damage, debris or restrictions to the lower intake manifold ports

• Damage to the fuel rail mounting bolt holes

• Damage to the fuel rail

2. Inspect the lower intake manifold for the following conditions:


• Gouges or damage to the intake manifold sealing surfaces

• Damage to the lower intake manifold bolt bosses

• Damage to the fuel injector ports

3. Inspect the lower intake manifold sealing surfaces for warpage.


3.1. Locate a straight edge across the lower intake manifold sealing surfaces.

3.2. Insert a feeler gauge between the lower intake manifold and the straight edge. A lower intake manifold with warpage in excess of 0.5 mm (0.020 in) must be replaced.

4. Repair or replace the lower intake manifold as necessary.