Chevrolet Sonic Repair Manual: Crankcase Ventilation System Inspection/Diagnosis
- Results of Incorrect Operation
-
A plugged positive crankcase ventilation (PCV) orifice or hose may cause the following conditions:
- Rough idle
- Stalling or slow idle speed
- Oil leaks
- Oil in the throttle body
- Sludge in the engine
- Functional Check
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With these systems, any blow-by in excess of the system capacity, from a badly worn engine, sustained heavy load, etc., is exhausted into the throttle body and is drawn into the engine.
Proper operation of the crankcase ventilation system depends upon a sealed engine. If oil slugging or dilution is noted and the crankcase ventilation system is functioning properly, check the engine for a possible cause. Correct any problems.
If an engine is idling rough, inspect for a clogged PCV orifice, a dirty vent filter, air cleaner element, or plugged hose. Replace as required. Use the following procedure:
- Remove the PCV hose from the cylinder head cover.
- Operate the engine at idle.
- Place your thumb over the end of the hose in order to check for a vacuum. If there is no vacuum at the hose, inspect for the following items:
- Plugged hoses
- The manifold port
- Turn OFF the engine.
- Inspect the PCV orifice in the cylinder head cover for debris or blockage.
PCV
...
Positive Crankcase Ventilation Hose/Pipe/Tube Replacement
Removal Procedure
Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct
Replacement.
Open the 2 positive crankcase ventilation pipe retainer clips ...
Other materials:
Headlining Trim Panel Replacement (Hatchback without Sunroof)
Headlining Trim Panel Replacement
Callout
Component Name
Warning: Do not attempt to repair or alter the head impact
energy-absorbing material glued to the headliner or to the garnish trims.
If the material is damaged ...
Transmission Fluid Level and Condition Check
Removal Procedure
Raise and support the vehicle. Refer to
Lifting and Jacking the Vehicle
Remove the front suspension skid plate, if equipped.
Refer to Drivetrain and Front Suspension Frame Skid
Plate Replacement
Place a basin underneath the vehicle.
Clean away all ...
Front Wheel Drive Shaft Seal Replacement - Left Side
Special Tools
DT-446 Installer Drift
DT-7004 Slide Hammer
DT-23129 Universal Seal Remover
For equivalent regional tools, refer to Special Tools.
Removal Procedure
Raise and support the vehicle. Refer to
Lifting and Jacking the Vehicle.
Remove the front suspension s ...
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