Jeep Cherokee 2000 Service Manual - page 1100
CONDITION
POSSIBLE CAUSES
CORRECTION
ENGINE RPM WILL NOT
REACH RATED SPEED
(CONT.)
6. Improperly operating injection pump.
6. Repair or replace injection pump.
LOW POWER
1. Fuel control lever not moving to full
throttle.
1. Check/correct for stop-to-stop travel.
2. High oil level.
2. Check/correct oil level.
3. Engine overloaded.
3. Check for added loading from
accessories or driven units, brakes
dragging and other changes in vehicle
loading. Repair/replace as needed.
4. Slow throttle response caused by
leaking or obstructed air control tube
or improperly operating control in the
pump.
4. Check for leaks and obstructions.
Tighten the fittings. Repair or replace
the pump if the controls are not
functioning.
5. Inadequate intake air flow.
5. Inspect/replace air cleaner element.
Look for other restrictions.
6. Inadequate fuel supply. Air in the
fuel.
6. Check the flow through the filter to
locate the source of the restriction.
Check fuel pressure and inlet
restriction.
7. Excessive exhaust restriction.
7. Check/correct the restriction in the
exhaust system.
8. High fuel temperature.
8. Verify that fuel heater is off when
engine is warm. Check for restricted
fuel drain tubes. Repair/replace as
needed.
9. Poor quality fuel or fuel
contaminated with gasoline.
9. Verify by operating from a temporary
tank with good fuel. Check for
presence of gasoline. Replace
fuel/water separator filter.
10. Air leak between the turbocharger
and the intake manifold.
10. Check/correct leaks in hoses,
gaskets, charge air cooler and around
mounting capscrews or through holes
in the manifold cover.
11. Exhaust leak at the manifold or
turbocharger.
11. Check/correct leaks in the manifold
or turbocharger gaskets. If manifold is
cracked, replace manifold.
12. Improperly operating turbocharger.
12. Inspect/replace turbocharger.
13. Wastegate operation.
13. Check wastegate operation.
14. Valve not operating.
14. Check for bent push rod, replace if
necessary.
15. Worn or improperly operating
injectors.
15. Check/replace injectors.
16. Incorrect injection pump timing.
16. Verify injection pump timing (see
Group 14, Fuel System).
17. Improperly operating injection
pump.
17. Repair or replace injection pump.
9 - 6
ENGINE
XJ
DIAGNOSIS AND TESTING (Continued)