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Unread 11-13-2007   #1 (permalink)
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Default 1997 Mustang GT check engine codes P0171, P1130, P1131

My 1997 GT has 148k miles. It idles a little rough, racing a bit. Otherwise performance is fine. Codes indicate it is running too lean. Note that I cracked the plastic cover when I replaced the air filter a while back. Wondering what to fix first. thx
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Unread 11-13-2007   #2 (permalink)
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Originally Posted by oldnavy View Post
My 1997 GT has 148k miles. It idles a little rough, racing a bit. Otherwise performance is fine. Codes indicate it is running too lean. Note that I cracked the plastic cover when I replaced the air filter a while back. Wondering what to fix first. thx
the 2 front o2 sensors. i had the same codes a few months back, turns out the o2 sensors (front ones) were going bad.
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Unread 11-14-2007   #3 (permalink)
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Default Pcm Codes

Quote:
Originally Posted by oldnavy View Post
My 1997 GT has 148k miles. It idles a little rough, racing a bit. Otherwise performance is fine. Codes indicate it is running too lean. Note that I cracked the plastic cover when I replaced the air filter a while back. Wondering what to fix first. thx

Hope this helps....
Attached Files
File Type: doc PCM Trouble Codes.doc (39.0 KB, 863 views)
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Unread 11-14-2007   #4 (permalink)
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So if I replace the O2 sensors that should resolve the 1130 and 1131 codes, but what do I do about P0171 "system too lean"?
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Unread 11-14-2007   #5 (permalink)
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it will solve that issue as well. the problem isnt that you were originally running, its that the o2 sensors arent reading properly anymore, which in my case caused my car to run really rich (when a lean condition appears, the ECU tries to correct by adding more fuel to the a/f mixture. if you arent really running lean but your faulty o2 sensors say you are, the computer will go based off that wrong info and add more fuel to the mixture and you will in fact be running rich, even tho the o2 sensors still say you are running lean)
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Unread 11-15-2007   #6 (permalink)
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Thanks alot, now I have something to do this weekend. I'll let you know how it goes.
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Unread 11-15-2007   #7 (permalink)
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Thanks alot, now I have something to do this weekend. I'll let you know how it goes.
cool. have fun, ive heard replacing o2's on stock mid pipes are a PITA. dont know what you have, but have fun anywas!
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Unread 11-16-2007   #8 (permalink)
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Quote:
Originally Posted by oldnavy View Post
My 1997 GT has 148k miles. It idles a little rough, racing a bit. Otherwise performance is fine. Codes indicate it is running too lean. Note that I cracked the plastic cover when I replaced the air filter a while back. Wondering what to fix first. thx
which part of the air filter housing did you break? before or after the maf?
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Unread 11-22-2007   #9 (permalink)
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replaced O2 sensor and cleared all codes. Air filter housing is broken before MAF where it attaches to body. Maybe duct tape?
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Unread 11-23-2007   #10 (permalink)
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replaced O2 sensor and cleared all codes. Air filter housing is broken before MAF where it attaches to body. Maybe duct tape?
you dont need to, but it wont hurt. electrical tape makes it look cleaner/better than duct tape, and will hold just as good
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