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Codes P0171 & P0174

This is a discussion on Codes P0171 & P0174 within the Computer & Tuning forums, part of the LSx Technical Help Section category; what could be causing these codes? they have been on for a bit. i can clear them and they will ...

  1. #1
    Junior Member
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    Black
    2000 WS-6

    Codes P0171 & P0174

    what could be causing these codes? they have been on for a bit. i can clear them and they will stay of for a while but come back on. and occasionally it will go off itself but not for long.

    thanks in advance.

  2. #2
    Spartan_Angel
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    Just wanted to say Gig 'Em ... but I can't help you with your problem, lol

  3. #3
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    You're running lean on both banks - sometimes people get these codes with an aftermarked MAF - assuming your stock here's a few things to check out on the diagnostic page in Helms when you throw both codes together:

    exhaust leaks
    precat 02 sensors secure
    vacuum leak
    intake air leak

    I'd also make sure the MAF connection is good and the MAF itself is clean.

  4. #4
    Senior Member ninobrn99's Avatar
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    Pewter
    all bore 370 Trans Am

    have you recently messed with the intake manifold? if so, then thats your problem. are you running a k&n filter? you maf elements could be covered with oil from it and be throwing it off also. If its been that way for a while, you may also want to consider new o2 sensors. What mods do you have done and whats the last thing you messed with?

  5. #5
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    2001 Camaro SS

    I have the same exact thing going on with my 00 z28. Except when they come on my idle starts to drop. I was thinking it was the 02's. I did not know it could be this other stuff.

  6. #6
    Member Rob Mellinger's Avatar
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    1998 Trans Am m6

    I had same code problems, turned out to be slp maf. Installed stock one, no more codes. 200$ waste of money.

  7. #7
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    yes, a list of mods would be helpful.

  8. #8
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    if stock MAF, then a vauum leak is most likely. one of two spots. the most likely is the rubber line between the PCV valve and intake. it likes to rot from the underside. typical. second would be the EGR tube seal slipped out of place.

  9. #9
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    Quote Originally Posted by mrr23 View Post
    if stock MAF, then a vauum leak is most likely. one of two spots. the most likely is the rubber line between the PCV valve and intake. it likes to rot from the underside. typical. second would be the EGR tube seal slipped out of place.

    This was exactley my problem! 5/16 fuel line for a 1.50 and now it runs great!

  10. #10
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    usually it. i see you are in orlando. you coming to my birthday on the 21st?
    sep 21 birthday party - orlando, florida

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