GM Service Manual Online
For 1990-2009 cars only
Makes
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GMC_Truck
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2007
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Sierra Classic - 4WD
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Diagnostic Navigation
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Vehicle Diagnostic Information
🢒 Crankcase Ventilation System Inspection/Diagnosis
A plugged positive crankcase ventilation (PCV) pipe/passage way may cause:
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Rough idle
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Stalling or slow idle speed
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Oil leaks
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Sludge in the engine