1999 Ford Expedition spark knocking and backfiring under st

Tiny
WTMOORE
  • MEMBER
  • 1999 FORD EXPEDITION
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 240,000 MILES
Onlly does this when in overdrive. Spark knocking and backfiring. If you manually take out of overdrive it stops. Have 4 problem codes. P0171, P0174, P0401, P1450. Does anyone have any ideas about this problem. Thanks
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Sunday, April 5th, 2009 AT 8:36 PM

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Tiny
RASMATAZ
  • MEMBER
Check the EGR valve
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Sunday, April 5th, 2009 AT 9:34 PM

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