Navajo 4WD V6-4.0L OHV (1991)
Vacuum Regulator (2-Port)
2-Port Vacuum Regulator
1.
Remove the vacuum line from the output port, and install a vacuum gauge.
2.
With engine at idle, the vacuum gauge should read between 10.5-13.5" vacuum (35.7 - 45.9 kPa).
3.
If the vacuum gauge reading is not within specified range, replace the regulator.
Vacuum Regulator (3-Port)
3-Port Vacuum Regulator
1.
Remove the vacuum line from the distributor port of the regulator valve, and install a vacuum gauge.
2.
With the engine at idle, the vacuum gauge reading should be within 1" vacuum (3.4 kPa) of calibration point.
3.
Vacuum calibration points are identified, with the different color codes:
-
Black is 6" vacuum (20 kPa)
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Green is 7" vacuum (23.6 kPa)
-
Red is 8" vacuum (27 kPa)
4.
If gauge reading does not meet color code indicator, replace vacuum regulator.
Vacuum Regulator (4-Port)