Chevrolet Sonic manuals

Chevrolet Sonic Repair Manual: Crankcase Ventilation System Inspection/Diagnosis

Chevrolet Sonic Repair Manual / Powertrain / Engine / Emissions / PCV / 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:

  1. Remove the PCV hose from the cylinder head cover.
  2. Operate the engine at idle.
  3. 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:

    Vehicle Messages
    DIC messages display when the status of the vehicle has changed and action may be needed to correct the condition. Multiple messages appear one after another. Press any of the DIC buttons on the turn signal lever to acknowledge and clear them from the display. More urgent messages cannot be cle ...

    System Settings
    Auto Volume This feature automatically adjusts the radio volume to compensate for road and wind noise. The level of volume compensation can be selected, or the feature can be turned off. 1. Press . 2. Select Settings. 3. Select Radio Settings. 4. Select the setting by pressing < or > ...

    Rear Side Door Adjustment (4 Door Notch Back 69)
    Rear Side Door Adjustment Callout Component Name 1 Rear Side Door Caution: Refer to Fastener Caution. Procedure Loosen the rear door hinge bolt?€‰(Qty:?€‰4) to adjust the rear door. A ...

    © 2014-2025 Copyright www.csmans.com
     
    0.0088