DELPHI EFI Troubleshooting Guide Condition Possible Cause 38 KohlerEngines.com 24 690 01 Rev. D Engine Starts Hard or Fails to Start When Hot. Faulty spark plugs. Fuel pump not running. Fuel pressure low. ,QVXI¿FLHQWIXHOGHOLYHU\ TPS set incorrect (ECU Reset and TPS Initialization). Crankshaft position sensor loose or faulty. TPS faulty. Engine temp sensor faulty. Faulty injectors. Engine Stalls or Idles Roughly (cold or warm). Faulty spark plugs. ,QVXI¿FLHQWIXHOGHOLYHU\ TPS set incorrect. TPS faulty. Faulty engine temperature sensor. Faulty injectors. Engine Misses, Hesitates, or Stalls Under Load.
)XHOLQMHFWRU V IXHO¿OWHUIXHOOLQHRUIXHOSLFNXSGLUW\UHVWULFWHG Dirty air cleaner. ,QVXI¿FLHQWIXHOSUHVVXUHRUIXHOGHOLYH 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. 'LUW\DLU¿OWHU ,QVXI¿FLHQWIXHOGHOLYHU\ 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).