D50/Power Ram 50 L4-2555cc 2.6L SOHC (1987)
Idle Speed: All Technical Service Bulletins
High Altitude Conversion Package
Models
1987 SJ & PB Two & Four Wheel Drive Vehicles
Subject
High Altitude Conversion Packages
Index
EMISSIONS
Date
March 16, 1987
No.
25-02-87 (C1-25)
P-919
Conversion packages are now available to accommodate a customer who wishes to convert his low altitude vehicle for improved high altitude engine
performance (4,000 feet above sea level).
Vehicles with low altitude package transferred to service in high altitude areas may exhibit undesirable driveability.. The installation of this high altitude
conversion package is voluntary and at the owner's expense.
PARTS REQUIRED
Vehicle
Engine
Transmission
Package No.
Ram 50 2WD (PB)
2.0L
Manual Only
MD120042
Ram 50 2WD (PB)
2.0L
Automatic Only
MD120043
Ram 50 2WD (PB)*
2.6L
Both
MD120044
Ram 50 2WD (PB)**
2.6L
Both
MD120045
Ram 50 4WD (PB)
2.6L
Both
MD120045
Ram Raider (SJ)
2.6L
Both
MD120046
*
Except 2,000 pound payload vehicle ** 2,000 Pound payload vehicle
FIGURE 1
CONVERSION PROCEDURE
To improve the above altitude-related condition, the basic timing must be advanced an additional 5~. The correct timing specifications are shown in
Figure 1. On vehicles not so equipped, an altitude compensator must be installed to prevent an overrich condition from occurring.
1.
Using the procedure outlined in the appropriate service manual, reset basic timing to the following specifications.
2.
Install a dual diaphragm vacuum advance assembly supplied in package as outlined in the appropriate service manual.
