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TROUBLESHOOTING GUIDE
Engine Starts Hard or
Fails to Start When
Cold
Engine Starts Hard or
Fails to Start When
Hot
Engine Misses,
Hesitates, or Stalls
Under Load
Low Power
66 690 14 Rev. A
Fuel pump not running.
Engine temp sensor faulty.
Incorrect fuel pressure.
TPS faulty.
TPS off set incorrect.
Old/stale fuel.
Low system voltage.
Speed sensor loose or faulty.
Faulty injectors.
Faulty coils.
Faulty spark plugs.
Fuel pressure low.
Fuel pump not running.
Engine temp sensor faulty.
Insuffi cient fuel delivery.
TPS faulty.
TPS off set incorrect.
Speed sensor loose or faulty.
Faulty injectors.
Faulty spark plugs.
Fuel injector(s), fuel fi lter, fuel line, or fuel pick-up dirty/restricted.
Dirty air cleaner.
Insuffi cient fuel pressure or fuel delivery.
Vacuum (intake air) leak.
Improper governor setting, adjustment or operation.
Speed sensor malfunction.
TPS faulty TPS Initialization Procedure incorrect.
Bad coil(s), spark plug(s), or wires.
Faulty/malfunctioning ignition system.
Dirty air fi lter.
Insuffi cient fuel delivery.
Improper governor adjustment.
Plugged/restricted exhaust.
One injector not working.
Basic engine problem exists.
TPS faulty.
Throttle plates in throttle body/intake manifold not fully opening to WOT.
KohlerEngines.com
EFI System
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