Dodge ram truck 3500 1996 Service Manual page 1007

B R ENGINE 9 - 1 7
D I A G N O S I S A N D T E S T I N G (Continued)
S E R V I C E DIAGNOSIS—DIESEL—PERFORMANCE—CONT.
CONDITION
POSSIBLE CAUSES CORRECTION
ENGINE RUNS ROUGH
CONT.
4. Incorrect valve operation.
5. Injection pump timing incorrect.
6. Improperly operating injectors.
7. Defective injection pump
(delivery valve).
8. Camshaft out of time.
9. Damaged camshaft or tappets.
4. Check for a bent push rod and adjust
valves. Replace push rod, if necessary.
5. Check/time pump (refer to Group 14,
Fuel System).
6. Replace inoperative injectors.
7. Repair or replace injection pump.
8. Check/correct gear train timing
alignment,
9. Inspect camshaft valve lift. Replace
camshaft and tappets.
ENGINE RPM WILL NOT
REACH RATED SPEED
1. Engine overload.
2. Improperly operating
tachometer.
3. Throttle linkage worn or
incorrectly adjusted.
4. Inadequate fuel supply.
5. Air/fuel controls leak.
6. Improperly operating injection
pump.
1. Verify high idle speed without load.
Investigate operation to be sure correct
gear is being used.
2. Verify engine speed with hand
tachometer, correct as required.
3. Adjust linkage for stop-to-stop fuel
control lever travel. Replace linkage if
necessary.
4. Check the fuel flow through the system
• to locate the reason for inadequate fuel
supply, correct as required.
5. Check and repair leak. Check AFC
tubing for obstruction.
6. Repair or replace injection pump.
LOW POWER
1. Fuel control lever not moving
to full throttle.
2. High oil level.
3. Engine overloaded.
4. Slow throttle response caused
by leaking or obstructed air
control tube or improperly
operating control in the pump.
5. Inadequate intake air flow.
6. Inadequate fuel supply. Air in
the fuel.
7. Excessive exhaust restriction.
1. Check/correct for stop-to-stop travel.
2. Check/correct oil level.
3. Check for added loading from
accessories or driven units, brakes
dragging and other changes in vehicle
loading. Repair/replace as needed.
4. Check for leaks and obstructions.
Tighten the fittings. Repair or replace
the pump if the controls are not
functioning.
5. Inspect/replace air cleaner element.
Look for other restrictions.
6. Inspect/correct leaks in the high
pressure lines, fittings injectors sealing
washers or delivery valve seals.
7. Check/correct the restriction in the
exhaust system.
J9509-148