Chevrolet Sonic Repair Manual: Crankcase Ventilation System Inspection/Diagnosis
- Results of Incorrect Operation
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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:
Radio Frequency Statement
This vehicle has systems that operate on a radio frequency that comply with Part
15 of the Federal Communications Commission (FCC) rules and with Industry Canada
Standards RSS‐GEN/210/220/310.
Operation is subject to the following two conditions:
1. The device may not cause harmful inter ...
Generator Pulley Replacement (LUV)
Generator Pulley Replacement
Callout
Component Name
Preliminary Procedure
Remove the generator. Refer to Generator Replacement.
1
Generator Pulley Nut Cap
2
Generator Pul ...
Differential Case Assemble
Special Tools
J-810721 Axle Shaft Seal Remover Support Base
R-0407011 Bearing Race Remover
R-0407012 Differential Carrier Cone Bearing Cap Driver
R-0007761 Universal Handle for Pullers and Installers
S-9407194 Speed Sensor Impeller Ring Installer
S-9407195 Pinion Gear Case Bearing I ...
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