89 Sable runs very rich

Tiny
KYORK
  • MEMBER
  • 1989 ALL OTHER MAKES ALL OTHER MODELS
1989 Murcury Sable 97000 miles 3.8L. My car is running very rich, the oxegen sensors are throwing codes 41 and 91 indicating a system lean. I replaced the O2 sensors and no change. So my O2 sensors keep telling the computer it is running lean, so it adds more gas and runs very rich at about 14mpg. Any thoughts
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Friday, December 1st, 2006 AT 10:02 AM

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Tiny
MERLIN2021
  • EXPERT
2 things this could be Mass air flow or PCM
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Tuesday, March 6th, 2007 AT 7:43 AM

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