3919 690 01 Rev. -- KohlerEngines.com
EFI SYSTEM
Troubleshooting Guide
Condition Possible Cause
Engine Stalls or
Idles Roughly
(cold or warm).
Faulty spark plugs.
Insuffi cient fuel delivery.
TPS set incorrect.
TPS faulty.
Faulty engine temperature sensor.
Faulty injectors.
Engine Misses,
Hesitates, or Stalls
Under Load.
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.
TPS faulty, mounting problem or TPS Initialization Procedure incorrect.
Bad coil(s), spark plug(s), or wires.
Low Power
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 or mounting exists.
Throttle plate in throttle body not fully opening to WOT stop (if equipped).
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