Rough Idle (Irregularly Firing Or Engine Shaking) - Dodge D250 1990 Service Manual

Base Engine Components
DODGETurbo Diesel
Troubleshooting Logic
Page9A-H
Rough Idle (Irregularly Firing Or Engine Shaking)
Cause
Correction
Cold Engine
Refer to Troubleshooting Logic for
Intake Manifold Heater System.
OK
•
Idle Speed Too Low for the Accessories Check/Adjust Low Idle Screw.
OK
Engine Mounts Damaged or Loose Verify Condition of Mounts. Engine Mounts Damaged or Loose Verify Condition of Mounts.
OK
±
High Pressure Fuel Leak
Inspect/Correct Leaks in the High
Pressure Lines, Fittings or Delivery
Valves.
Inspect/Correct Leaks in the High
Pressure Lines, Fittings or Delivery
Valves.
OK
t
Air in the Fuel System
Bleed the Fuel System and Correct the
Source of the Air.
OK
t
Sticking Needle Valve in an Injector
Check and Replace the Injector.