Jeep Cherokee 2000 Service Manual - page 1101
CONDITION
POSSIBLE CAUSES
CORRECTION
EXCESSIVE EXHAUST
SMOKE
1. Engine running too cold (white
smoke).
1. Refer to troubleshooting for coolant
temperature below normal (refer to
Group 7, Cooling System). Inspect
cylinder head heater plugs for proper
operation.
2. Improper starting procedure (white
smoke).
2. Use proper starting procedures.
3. Fuel supply inadequate.
3. Check fuel supply pressure and inlet
restriction.
4. Injection pump timing.
4. Check and time pump (refer to
Group 14, Fuel System).
5. Inadequate intake air.
5. Inspect/change air filter. Look for
other restriction. Check charge air
cooler for obstructions.
6. Air leak between turbocharger and
intake manifold.
6. Check/correct leaks in the air
crossover tube, hoses, gaskets,
mounting capscrews or through holes
in the manifold cover.
7. Exhaust leak at the manifold or
turbocharger.
7. Check/correct leaks in the manifold
or turbocharger gaskets. If cracked
replace manifold.
8. Improperly operating turbocharger.
8. Inspect/replace turbocharger.
9. Improperly operating injectors.
9. Check and replace inoperative
injectors.
10. Improperly operating or overfueled
injector pump.
10. Repair or replace injection pump.
11. Piston rings not sealing (blue
smoke).
11. Perform blow-by check. Correct as
required.
ENGINE WILL NOT
SHUT-OFF
1. Fuel shutoff solenoid inoperative.
1. Check/replace fuel shutoff solenoid.
2. Engine running on fumes drawn into
the air intake.
2. Check the air intake ducts for the
source of fumes. WARNING: In case
of engine runaway due to flammable
fumes from gasoline spills or
turbocharger oil leaks being sucked
into the engine, shut off engine
ignition switch first then use a CO2
fire extinguisher and direct the
spray under the front bumper to
remove oxygen supply. The engine
air intake is on the passenger side
behind the bumper. The fire
extinguisher must be directed at this
location for emergency shutdown
conditions.
3. Fuel injection pump malfunction
3. Repair or replace fuel injection
pump.
XJ
ENGINE
9 - 7
DIAGNOSIS AND TESTING (Continued)