1994 Ford Explorer closed loop

1994 FORD EXPLORER
140,000 MILES • 6 CYL • 4WD • AUTOMATIC
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SHAMUS 1966
  • MEMBER
  • 1 POST
engine preignition on hills hooked up mac taskmaster and saw rich condition and closed loop all the time is my o2 sensor bad computer had no codes and passed all koer tests coolant was at operating temp.
Feb 8, 2009 at 6:16 AM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
have you checked your MAF sensor? just curious.

the o2 sensors are in closed loop even with engien off? disconnect the sensors and see if it runs better.
Feb 22, 2009 at 11:31 AM
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