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0171 and 0174 codes HELP!

This is a discussion on 0171 and 0174 codes HELP! within the General Help forums, part of the LSx Technical Help Section category; I've been getting detonation for a long time now and to make a long story short Ive changed Plugs (Denso),fuel ...

  1. #1
    tattoo artist,esquire sic2001's Avatar
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    navy blue metallic
    2001 trans am

    0171 and 0174 codes HELP!

    I've been getting detonation for a long time now and to make a long story short Ive changed Plugs (Denso),fuel pump (racetronix),04 z06 heads p&p,mild cam and Ive cleaned the MAF with maf cleaner.
    I cant even dyno the car it detonates so bad the guy cant get a decent pull on the motor. Im soooo fed up with this and hope someone has a quick and inexpensive fix. I have a 01 A4 with 100,00 miles.

    Any help fellas would be GREAT!

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    old timer blue02Z's Avatar
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    Navy Blue Metallic
    2002 Z28

    well, looks like your running lean. did you upgrade your fuel injectors? also, what about your o2 sensors. are they good and working correctly, do you have cats?

  3. #3
    tattoo artist,esquire sic2001's Avatar
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    navy blue metallic
    2001 trans am

    The beast is LOOSE!! I saw on a thread that a vacume leak can lean out the engine so I started with the PVC system where I had added a do- -it- yourself catch can mod with an air compressor filter. It had slid over and had a hole rubbed through the back by the pulley where I couldnt see it till I took it off.
    So after all this it is running like a bat out of hell. Its like a whole new car its that drastic of difference. Im going to dyno it next week and then its all about just driving and enjoying....till the next mod. (maybe racing seats

  4. #4
    old timer blue02Z's Avatar
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    Navy Blue Metallic
    2002 Z28

    great! yeah vacuum leaks will do that due to the fact its unmetered air and will def. lean it out. good luck and put up your #s

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