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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Mechanical - 5.3L (L83) Or 6.2L (L86) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> Crankcase Ventilation System Inspection/Diagnosis

Crankcase Ventilation System Inspection/Diagnosis

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. 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
  • Restricted or blocked PCV valve
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
  • PCV valve leaking or stuck open
Stalling or slow idle speed Inspect for any of the following conditions:
  • Restricted or kinked engine vent hose
  • Leaking (damaged) PCV hose
  • Restricted or blocked PCV valve
High idle speed Inspect for the following conditions:
  • Inspect for a leaking (damaged) PCV hose
  • PCV valve leaking or stuck open
  • PCV tube from PCV valve to intake manifold disconnected
Sludge in the engine Inspect for restricted or kinked PCV hose or engine vent hose
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