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Thread: 2016 F-150 Shelby Truck WOT will not accelerate and strange data

  1. #1
    Potential Tuner
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    Jul 2011
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    2016 F-150 Shelby Truck WOT will not accelerate and strange data

    Guys,

    Long time lurker...almost never post.
    However, I have run into something where I need a little help.

    NOTES: 2016 Ford F-150 Shelby Truck, dash tag indicates it's #11, appears to be as-delivered (no additional mods)

    Here is the read file and a datalog.

    Symptoms:
    1. Truck stops accelerating during WOT around 4200-4500rpm
    2. MIL will start flashing and keep flashing after attempting WOT. Will stop flashing and turn off after ~1 minute.
    3. Key On Engine Off, data becomes non-sensical when doing a slow sweep to WOP/WOT


    Aside from WOT, the truck seems to drive just fine. Runs terrible when going WOT.

    Any thoughts?


    Matt
    Attached Files Attached Files
    Last edited by nine; 11-30-2023 at 04:09 PM. Reason: better title

  2. #2
    Check to see that your have the latest version of VCM scanner. You can get some weird readings from an older version or try beta. The one time that I saw you get into power enrichment briefly you had .64 lambda on the right and .82 on the left. Also your IATs are hot for 64 degree ambient temp. I would expect them to drop alot on your highway drive. Check to see that you are circulating coolant in your intercooler. When you took off from 0 mph it looked normal. Timing increased and it stayed right at 1.00 lambda. Any codes? If the truck has not been modified from the way it came from the dealer, I would look into a mechanical problem. Most likely not tune related.

  3. #3
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    I'm on version 5.0.4
    It reports, "No update found".
    I tried going WOT several times throughout the course of this ~20 minute datalog. Almost every time I went WOT, the engine would feel like it hit a limiter/lose power/not accelerate. This coincides with the data showing 0's and negative values. If I tried "aggressive" part throttle instead of WOP/WOT, the truck would pull for a bit.

    As for the IAT's sure, I can check that when the truck comes back but, the recorded IAT's are not high enough to create the symptoms/lack of power that I notice.

    When it showed up it had P0420, P0430, and a P0300 stored--a couple of catalytic converter efficiency codes and a random misfire code. I pulled a spark plug and found that the previous shop, a Ford dealer, had installed stock F-150 replacement spark plugs with stock gap. I replaced them with LTR7IX-11's gapped at 0.032" and cleared the codes. In the course of my troubleshooting and test drives the codes did not come back.

    From what I can tell, this truck is unmodified from the way it came from the dealer.

    ...scratching my head over this one...

  4. #4
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    Another thing...

    With Key On Engine Off, when doing a throttle the sweep data also ends up showing 0's and negative values.