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:

    Front Side Door Lock Cylinder Rod Replacement
    Front Side Door Lock Cylinder Rod Replacement Callout Component Name Preliminary Procedure Remove the rear side door window rear guide. Refer to Rear Side Door Window Rear Guide Replacement. Remove the rear side door ...

    Backup Lamp Switch Replacement
    Removal Procedure Disconnect the electrical connector from the backup lamp switch?€‰(1). Remove the backup lamp switch?€‰(1) from the transmission. Remove and DISCARD the backup lamp switch washer from the backup lamp switch. Installation Proc ...

    Transmission Replacement (With 1.2L or 1.4L Engine)
    Removal Procedure Remove the battery tray. Refer to Battery Tray Replacement. Without draining the coolant or removing the hoses, remove and position aside the radiator surge tank. Refer to Radiator Surge Tank Replacement. Remove the transmission range selector lever cabl ...

    © 2014-2024 Copyright www.csmans.com
     
    0.0057