Specifications

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.

9. Allow the engine to idle for approximately 30 seconds. Do not allow more than 3 psi (20.7 kPa) of

pressure to develop in the engine crankcase.

10.

If the attached vacuum / pressure gauge does not indicate that a vacuum is present in the engine

crankcase, then the intake manifold plenum pan gasket is good and no further internal engine vacuum

leak diagnosis is required.

11.

If an internal vacuum leak is present then perform the Repair Procedure.

PARTS REQUIRED:

For the 5.2L / 5.9L:

1 04897383AC Package, Intake Manifold Flange Gasket and Bolts

1 05017208AA Gasket, Intake Manifold Plenum Pan

15 06034583 Bolt, Intake Manifold Plenum Pan

1 53030541 Gasket, Throttle Body

2(AR) 04318001 Conditioner, Combustion Chamber

For the 3.9L:

1 04897382AC Package, Intake Manifold Flange Gasket and Bolts

1 05017207AA Gasket, Intake Manifold Plenum Pan

14 06034583 Bolt, Intake Manifold Plenum Pan

1 53030541 Gasket, Throttle Body

2(AR)04318001 Conditioner, Combustion Chamber

REPAIR PROCEDURE:

Refer to the appropriate year Service Manual, Section 9: ENGINE for removal and installation

instructions.