Vacuum reservoir diagram for 1998 Dodge RAM 1500 5.2 L

Either replacing the vacuum reservoir or attaching the valve.First you can try attaching the valve and see if that helps, if not then you have to get the vacuum reservoir replaced.

Most people over in the Dodge forum agree that the solution is just to install a check-valve in one of the vacuum lines or just to the right of the T show in those diagrams and that has solved the problem for most people on the forum.
Click this link below to see the diagram for how to attach the valve :----

Its same for 1998 model too, so dont get confused:----

http://dodgeram.info/tsb/1996/24-01-96a.htm

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The vacuum reservoir cannot be repaired and, if faulty or damaged, it must be replaced.

REMOVAL

1. Disconnect and isolate the battery negative cable.
2. Remove the wiper arms from the wiper pivots. Refer to Wipers/Washers for the procedures.

Remove the Weather strip along the front edge of the cowl plenum cover/grille panel and the cowl plenum panel.

Remove the plastic screws that secure the cowl plenum cover/grille panel to the studs on the cowl top panel near the base of the windshield .

Lift the cowl plenum cover/grille panel from the cowl top far enough to access the vacuum reservoir near the right end of the cowl plenum.

1. Disconnect the vacuum supply hose from the vacuum reservoir, which is secured to the dash panel near the right end of the cowl plenum.
2. Remove the two nuts that secure the reservoir to the studs on the dash panel near the right end of the cowl plenum.
3. Remove the vacuum reservoir from the dash panel studs.

INSTALLATION

1. Install the vacuum reservoir on the dash panel studs. Tighten the mounting nuts to 2.8 NM (25 in. lbs.) .
2. Connect the vacuum supply hose to the vacuum reservoir.
3. Install the plastic screws that secure the cowl plenum cover/grille panel to the studs on the cowl top panel.
4. Install the weatherstrip along the front edge of the cowl plenum cover/grille panel and the cowl plenum panel.
5. Install the wiper arms on the wiper pivots. Refer to Wipers/Washers for the procedures.
6. Connect the battery negative cable.

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FOR VACUUM DIAGRAMS SEE BELOW:-------------

See Figures 1, 2, 3, 4, 5, 6 and 7

Following are vacuum diagrams for most of the engine and emissions package combinations covered by this guide. Because vacuum circuits will vary based on various engine and vehicle options, always refer first to the vehicle emission control information label, if present. Should the label be missing, or should the vehicle be equipped with a different engine from the vehicle's original equipment, refer to the diagrams below for the same or similar configuration.

If you wish to obtain a replacement emissions label, most manufacturers make the labels available for purchase.

The labels can usually be ordered from a local dealer.

Fig. Fig. 1: The Vehicle Emission Control Information (VECI) label contains information critical to its performance

Fig. Fig. 2: The normal location of the VECI label

Fig. Fig. 3: Engine vacuum schematic vehicles with 5.2L and 5.9L engines

Fig. Fig. 4: Engine vacuum schematic vehicles with 3.9L and 5.2L engines

Fig. Fig. 5: Engine vacuum schematic vehicles with a 5.9L engine

Fig. Fig. 7: Engine vacuum schematic for 1995 - 1998 vehicles

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