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Thread: oh god help please p0068

  1. #1
    Tuner
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    Sep 2013
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    oh god help please p0068

    ok first a little background, 05 Silverado, 402, twin turbo s366's,no maf 3 bar os. last year with different engine I kept getting a p0068 and go into reduced engine power, checked wires,grounds, changed throttle body, did not fix, finally I thought about the decription, "MAF/MAP/throttle pos" I know its not the maf, pretty sure its not the throttle body, so I changed the brand new map from DIY autotune to a 3 bar from MSD. fixed it or so I thought. drove with no problems for the next 2 weeks, the second week was hot rod drag week and I got greedy and pushed too far and hurt the engine. brand new engine....as soon as I start ve tuning in pe I am back to the p0068. if I set p0068 to "no error reported" I get p0102 and p0103 and reduced engine power.
    the p1514/p0068 is set at 3.20 across the board and not coming close to that
    MAF CYLAIR MAX is set to 3.20
    maf freq fail is set th 0
    max delta airflow p0101 is maxed

    I know the sensor could possibly be the issue and ive got a new one coming. but ive attached the tune file and a scan file. failure happens around 8.56.49, 8.58.09, 8.58.49, 8.59.16.
    if anyone can take a look and tell me if there is anything you see that could be my problem it would be greatly appreciated, hell I might even send a reward if it fixed it
    Attached Files Attached Files

  2. #2
    Tuner
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    forgot to add ....
    the p1514/p0068, and MAF CYLAIR MAX have been maxed to 4.20 with no change
    ive also read the stickey that refers to this and has not helped
    Last edited by gharris1100; 08-12-2016 at 08:37 AM. Reason: forgot something

  3. #3
    Moderator
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    Moved to gen 3.
    Post a log and tune if you want help

    VCM Suite V3+ GETTING STARTED THREADS / HOW TO's

    Tuner by night
    CPX Tuning
    2005 Corvette, M6
    ECS 1500 Supercharger
    AlkyControl Meth, Monster LT1-S Twin, NT05R's
    ID1000's, 220/240, .598/.598, 118 from Cam Motion

    2007 Escalade, A6
    Stock

  4. #4
    Tuner
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    oops I meant t post in gen three.
    I FIXED IT in case any one ends up in the same situation I am heres the fix, if your tryin to make over 500 hp with the gen three dbw you will probably fall into the part in the sticky that says " in rare occasions you have to scale back the IFR injector flow rate table" I did that, I scaled it back 20% and took 10% off the ve above 100 kpa, no more reduced engine power so I can finally work on ve above 100 kpa, even though I scaled it back 10% its still super rich. so set up a histogram to log cyl airmass in grams and scale back the ifr and ve until they stay under 2.3 and life is good.
    what Im noticing is that I keep chasing my tail/ overshooting the ve so use the multiply 1/2 % sooner than you normally would. I think scaling down my make the %of error a little inaccurate.

  5. #5
    I have been having this same issue with a 2 bar cos today. So reduce or add 20% to the ifr table and 10% ve?