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05-16-6
  • MISFIRE, LACK OF POWER, SMOKE, SLOW CRANK IN COLD WEATHER ON INITIAL START UP - 6.0L ENGINE
Publication Date: August 2, 2005

FORD:
2003-2005 Excursion
2003-2006 F-Super Duty
2004-2006 E-Series, F-650, F-750

ISSUE:

Some 6.0L equipped 2003-2006 F-Super Duty, 2003-2005 Excursion, 2004-2006 F-650/750 and E-Series vehicles may exhibit a misfire, lack of power, smoke, or slow crank in cold weather on initial start up. This may be due to the oil viscosity being too high. The use of high viscosity multi-grade oil can slow cranking speed more than 30% at -20 F (-29 C), resulting in longer crank times. High viscosity multi-grade oil may delay fuel injection timing by slowing reaction of high-pressure oil control system integral to each injector.

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