GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
GMC_Truck
🢒
2006
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Yukon XL Denali
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Brakes
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Hydraulic Brakes
🢒 Crankcase Ventilation System Inspection/Diagnosis
A plugged positive crankcase ventilation (PCV) pipe/passage way may cause:
•
Rough idle
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Stalling or slow idle speed
•
Oil leaks
•
Sludge in the engine