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Date: Feb 27, 1998
Models: 1994-98 BR/BE Ram with 12 valve Cummins
Several strange things can happen if the 12 valve Cummins idle speed is too high or too low. Incorrect idle adjustment may cause different customer concerns - low and high idle problems can and should be corrected.
RPM BELOW SPECIFICATION
Typical low idle speed is caused by misadjusted low idle speed screw on the injector pump but high idle speed can be caused by many items. The following list will help in diagnosing high idle concerns.
|Idle speed misadjusted||Adjust low idle screw on injector pump|
|Misadjusted throttle/cruise control cable||Adjust cables|
|Throttle linkage rod binding||Clean and lubricate ball connections|
|Bent throttle rod||Replace rod|
|Broken return springs||Replace springs|
|Throttle/cruise cable damaged||Replace cable|
Correct speed is:
1994-1998 with AT - in drive with AC on 750 -800 RPM
1994-1998 with manual in neutral with AC on 750-800
Use DRB III or an optical tach such as Cummins #3377462 or Snap On MT139 or equals must be used. DO NOT USE THE INSTRUMENT PANEL TACH FOR SETTING OF IDLE SPEED.
Policy: Information only.
Thanks to Bob Bergevin for providing this TSB information
This page was edited on: May 3, 2004