Jeep Cherokee 2000 Service Manual - page 1098
CONDITION
POSSIBLE CAUSES
CORRECTION
ENGINE HARD TO START,
OR WILL NOT START
SMOKE FROM EXHAUST
(CONT.)
6. Air in fuel system or the fuel supply
is inadequate.
6. Check the flow through the filter and
bleed the system. Locate and eliminate
the air source.
7. Contaminated fuel.
7. Verify by operating the engine with
clean fuel from a temporary tank.
Check for presence of gasoline. Drain
and flush fuel supply tank. Replace
fuel/water separator filter.
8. Fuel screen plugged.
8. Check fuel screen.
9. One or more injectors worn or not
operating properly.
9. Check/replace improperly operating
injectors.
10. Worn or inoperative injection
pump.
10. Visually check fuel delivery with an
externally connected injector to one of
the pump outlets. Repair or replace the
pump if fuel is not being delivered.
11. Injection pump out of time.
11. Check/Time the pump (refer to
Group 14, Fuel System).
12. Engine compression low.
12. Check compression to identify the
problem.
13. Camshaft out of time.
13. Check camshaft timing.
ENGINE STARTS, BUT WILL
NOT KEEP RUNNING
1. Cylinder heads heater plugs relay
defective.
1. Verify system is working. Repair/
replace inoperative parts.
2. One or more cylinder head heater
plugs defective.
2. Verify system is working. Repair/
replace inoperative parts.
3. Intake air or exhaust system
restricted.
3. Visually check for exhaust restriction
and inspect the air intake.
4. Air in the fuel supply system or the
fuel supply is inadequate.
4. Check flow through the filter and
bleed the system. Locate and eliminate
the air source.
5. Fuel waxing due to extremely cold
weather.
5. Verify by inspecting the fuel filter.
Clean the system and use climatized
fuel. Replace fuel/water separator filter.
Check fuel heater for proper operation.
6. Contaminated fuel.
6. Verify by operating the engine with
clean fuel from a temporary supply
tank. Check for presence of gasoline.
Replace fuel/water separator filter.
SURGING (SPEED
CHANGE)
1. If the condition occurs at idle, the
idle speed is set too low for the
accessories.
1. Adjust the idle speed.
2. High pressure fuel leak.
2. Inspect/correct leaks in the high
pressure lines. Fitting and delivery
valve sealing washers.
3. One or more injectors worn or not
operating properly.
3. Check/replace the inoperative
injectors.
4. Improperly operating injection pump.
4. Replace the injector pump.
9 - 4
ENGINE
XJ
DIAGNOSIS AND TESTING (Continued)