Results 1 to 7 of 7

Thread: p0171 p0174 2007 corvette

  1. #1
    Potential Tuner
    Join Date
    Dec 2019
    Posts
    4

    p0171 p0174 2007 corvette

    I am throwing p0171 and p0174 codes. Cannot seem to find a vacuum leak, fuel pressure seems okay. Any ideas what could be wrong? Car has long tube headers, no cats and an aftermarket intake. Here is a log of driving the car. Lemme know what you think and what you need from me to know more. Thanks in advance.
    Attached Files Attached Files

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    13,533
    Did you check fuel pressure with a manual gauge?

    The channel you are logging for fuel pressure never moves, perhaps that channel does not work as there is no real pressure sensor on this vehicle.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Potential Tuner
    Join Date
    Dec 2019
    Posts
    4
    It has a fuel pressure gauge "built in". Reads from 40-60psi as driven

  4. #4
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    13,533
    What else can you say about this vehicle?

    Did the problem happen out of the blue?

    Did you just install these mods and the car hasn't been tuned yet?

    Did you smoke test the intake and exhaust for air leaks?
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  5. #5
    Potential Tuner
    Join Date
    Dec 2019
    Posts
    4
    Yes, 100% out of the blue. Intake and exhaust checked. It's almost as if the codes are fake. 50% of the time the car runs perfectly like it is brand new and then throttle blip and stumble when codes are thrown.

  6. #6
    Tuner
    Join Date
    Jan 2019
    Location
    White Hall, Arkansas
    Posts
    73
    Probably wouldn't hurt to check your connections at the MAF sensor. This looks like a good time to invest in a wideband if you don't already have one. Something's obviously not reading right.

  7. #7
    Senior Tuner mbray01's Avatar
    Join Date
    Dec 2013
    Location
    Slidell, La.
    Posts
    1,015
    Check the ground for the fuel pump. Notoriously famous for being loose
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
    Advanced Level Specialist
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
    Shop Owner