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Home >> Buick >> 1961 >> Invicta Eng CD 4H, Automatic 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 ventilator valve; therefore, never adjust carburetor idle without first checking crankcase ventilator check valve  . Test system as follows:
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