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Home >> Oldsmobile >> 1991 >> Cutlass Calais Base, 2D Coupe, 2.5 U, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 2.5L/151 TBI In-Line 4 VIN [U] >> Emission Control System >> PCV Diagram

PCV Diagram

NOTE: This engine does not use a "typical" PCV valve but rather, a PCV orifice.
Fig 1: PCV Valve Location (2.5L VIN U)
G50B14135Courtesy of GENERAL MOTORS CORP.
Fig 2: PCV Valve Orifice X-Ray View (2.5L VIN U)
G50C14136Courtesy of GENERAL MOTORS CORP.
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