Results 1 to 3 of 3

Thread: Fuel trims after new cam

  1. #1
    Potential Tuner
    Join Date
    Dec 2019
    Posts
    2

    Fuel trims after new cam

    I'm wondering if I should be looking for an exhaust leak. Attached is the scanner data. I have adjusted the VE tables based on the averages and got everything to zero. However, I'm noticing that my banks are far opposites of each other. Is this normal? I'm thinking I might have a leak or bad O2 sensor. You?

    Thank you for any help.
    Attached Files Attached Files

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    13,533
    If you flip flop o2 sensors side to side and the it moves the issue, then a bad o2 sensor could be likely but you may still have a lot of tuning if both turn way positive or negative.

    The VVE or VE and the MAF both need to be corrected.

    More thing can be looked once we know if the o2 sensors are okay.
    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
    2
    Quote Originally Posted by 5FDP View Post
    If you flip flop o2 sensors side to side and the it moves the issue, then a bad o2 sensor could be likely but you may still have a lot of tuning if both turn way positive or negative.

    The VVE or VE and the MAF both need to be corrected.

    More thing can be looked once we know if the o2 sensors are okay.
    Sometimes you look at a problem for too long and don't see clearly. I should have thought of that, thank you. I'll swap them and scan again.