Durango 4WD V8-5.9L VIN Z (1998)
4.
Attach a vacuum/pressure gauge to the end of the breather hose (Figure 1).
5.
Disconnect the PCV valve hose from the intake manifold.
6.
Seal off the intake manifold PCV valve hose port opening.
7.
Seal off the open end of the PCV valve hose (Figure 2).
NOTE:
DURING THIS DIAGNOSIS, IT WOULD BE NORMAL FOR THE ENGINE TO DEVELOP PRESSURE WITHIN THE ENGINE
CRANKCASE. THIS IS DUE TO THE NORMAL PROCESS OF EXHAUST BLOW-BY GASES LEAKING PAST THE ENGINE PISTON
RINGS AND ACCUMULATING IN THE ENGINE CRANKCASE. DO NOT ALLOW MORE THAN 3 PSI (20.7 kpa) OF PRESSURE TO
BUILD WITHIN THE ENGINE WHEN PERFORMING THE FOLLOWING DIAGNOSTIC PROCEDURE.
8.
Start the warmed engine and observe the vacuum gauge.
