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Home >> Buick >> 1970 >> GS Eng CD SP, Not Available Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Crankcase Ventilation Systems >> System Checking >> Notes
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System Checking: Notes

NOTE: An engine may idle slow or rough due to a clogged PCV valve; therefore, never adjust carburetor idle without first checking PCV valve for proper operation. Test system as follows:
Fig 1: 1968-74 CLOSED CRANKCASE VENTILATION SYSTEM (V8)
G09340459Courtesy of GENERAL MOTORS COMPANY
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