71
ENGINE TROUBLESHOOTING
12/150_23136625
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C en
Symptom
Problem
Solution
Engine emits black or gray exhaust
smoke
Improper type of fuel.
Use proper fuel.
Clogged or dirty air cleaner.
Service air cleaner.
Engine overloaded.
Reduce load.
Injection nozzles dirty.
See your authorized servicing dealer.
Electronic fuel system problem
See your authorized servicing dealer.
Turbocharger not functioning.
See your authorized servicing dealer.
Engine overheats
Engine overloaded.
Reduce load.
Low coolant level.
Fill radiator to proper level, check radiator and
hoses for loose connections or leaks.
Faulty radiator cap.
Have technician check.
Stretched poly
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vee belt or defective belt tensioner.
Check automatic belt tensioner and check belts for
stretching. Replace as required.
Low engine oil level.
Check oil level. Add oil as required.
Cooling system needs flushing.
Flush cooling system.
Defective thermostat.
Remove and check thermostat.
Defective temperature gauge or sender.
Check coolant temperature with thermometer and
replace, if necessary.
Incorrect grade of fuel.
Use correct grade of fuel.
High fuel consumption
Improper type of fuel.
Use proper type of fuel.
Clogged or dirty air cleaner.
Service air cleaner.
Engine overloaded.
Reduce load.
Improper valve clearance.
See your authorized servicing dealer.
Injection nozzles dirty.
See your authorized servicing dealer.
Electronic fuel system problem.
See your authorized servicing dealer.
Defective turbocharger.
See your authorized servicing dealer
Low engine temperature.
Check thermostat.
Undercharged electrical system
Excessive electrical load from added accessories.
Remove accessories or install higher output
alternator.
Excessive engine idling.
Increase engine rpm when heavy electrical load is
used.
Poor electrical connections on battery, ground
strap, starter, or alternator.
Inspect and clean as necessary.
Defective battery.
Test battery.
Defective alternator.
Test charging system.