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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Engine Mechanical - 6.0L (L96 LC8)) >> Diagnostic Information and Procedures >> Crankcase Ventilation System Inspection/Diagnosis

Crankcase Ventilation System Inspection/Diagnosis

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
Symptom Correction
External oil leak Inspect for any of the following conditions:
  • Restricted or kinked PCV hose or engine vent hose
  • Damaged, incorrect, or incorrectly installed PCV hose
  • Excessive crankcase pressure
Rough Idle Inspect for any of the following conditions:
  • Restricted or kinked PCV hose or engine vent hose
  • Leaking (damaged) PCV hose
  • Vacuum hoses worn or not properly installed
Stalling or slow idle speed Inspect for any of the following conditions:
  • Restricted or kinked engine vent hose
  • Leaking (damaged) PCV hose
High idle speed Inspect for a leaking (damaged) PCV hose
Sludge in the engine Inspect for restricted or kinked PCV hose or engine vent hose
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