Ram B1500, B2500, B3500, 1999-2003

Adjustments

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Idle Speed Adjustment



The low speed idle is the only adjustment that can be made to the injection pump. All other injection pump service requires a qualified diesel engine technician.

Use an optical diesel engine tachometer to read engine rpm. If necessary, adjust low idle speed at the low idle speed screw. If the vehicle is equipped with an automatic transmission, with the A/C on, set the low speed idle to 700 rpm. If equipped with a manual transmission, with the A/C ON , set the idle to 750 rpm. A special Cummins tool No. 3823750 is required to loosen the idle speed locknut for adjustment.


WARNING
This procedure applied to 1997-98 Models only. It applies only to low-speed idle. High-speed idle cannot be adjusted.

  1. Start the engine and run until at normal operating temperature.
  2.  
  3. An optical tachometer must be used to read engine speed; a conventional tachometer connected to the coil is useless in this instance.
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  5. Turn the air conditioning ON if equipped.
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Click image to see an enlarged view

Fig. Turn the screw shown to adjust the low idle speed

  1. Turn the idle speed screw until the desired idle speed is obtained. The specification for a vehicle equipped with automatic transmission is 750-800 rpm in DRIVE with A/C ON . The specification for a vehicle equipped with manual transmission is 780 rpm in Neutral with A/C ON .
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5.9L Engine
  1. Turn the idle speed screw until the desired idle speed is obtained. The specification for a vehicle equipped with automatic transmission is 700 rpm. The specification for a vehicle equipped with manual transmission is 750 rpm.

    Click image to see an enlarged view

    Fig. Idle speed adjusting screw location-5.9L diesel engine

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