Intake Manifold Cleaning and Inspection
Intake Manifold Cleaning and Inspection |
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. |
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. |
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.
|