RAM 2500 Truck 4WD V8-5.9L VIN Z LDC (1998)
Positive Crankcase Ventilation: Testing and Inspection
Fig. 13 Check Vacuum At PCV Valve - Typical
1. With engine idling, remove the Positive Crankcase Ventilation (PCV) valve from cylinder head (valve) cover. If the valve is not plugged, a hissing
noise will be heard as air passes through the valve. Also, a strong vacuum should be felt at the valve inlet.
Fig. 14 Check Vacuum At Crankcase Breather Opening - Typical
2. Install the PCV valve. Remove the crankcase breather/filter. Hold a piece of stiff paper, such as a parts tag, loosely over the opening of crankcase
breather/filter at the cylinder head (valve) cover.
3. The paper should be drawn against the opening in the cylinder head (valve) cover with noticeable force. This will be after allowing approximately
one minute for crankcase pressure to reduce.
