This is topic Code 91 in forum Tech Talk at Northern California Ford Owners  .


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Posted by stang up (Member # 11117) on :
 
Have code 91 koeo test .oxigen sensor problem,fuel pressure out of range,or injectors out of balance. So fuel pressure is at 31 32.I have liggter brown top injectors unknown # maybe 35# 36# .gonna swap oxigen sensors from other foxbody.any ideas?
 

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Posted by JZTRK (Member # 7641) on :
 
I had the same issue on my 90 30# red tops put 2 new bosch sensors code went away and it ran better
 

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