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
-
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:
Remote Keyless Entry (RKE) System
The RKE transmitter may work up to 60m (195 ft) away from the vehicle.
The RKE transmitter can have one of the two symbols for the remote trunk release.
With Remote Start Shown
Press the key release button to extend the key blade. The key can be used for
the ignition and all locks.
Press ...
Valve Guide Reaming, and Valve and Seat Grinding
Valve Cleaning Procedure
Use soft bristle wire brush to clean any carbon build-up from the valve
head. DO NOT use a wire brush on any part of the valve stem. The valve stem
is chrome plated to provide enhanced wear characteristics. Wire brushing
the stem could remove the chr ...
Camshaft Installation
Special Tools
EN-422 Installer
For equivalent regional tools, refer to Special Tools.
Note: Coat with MoS 2 lubricating paste. Refer to Adhesives, Fluids,
Lubricants, and Sealers.
Install the intake camshaft (1).
Note: Note the identification mark ...
0.0064