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Thread: Wideband installed, seems to run a bit rich

  1. #1
    Hybrid booster
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    Wideband installed, seems to run a bit rich

    Installed the PLX Wideband today in the Spirit R/T. Based on other experiences here, I installed it in the factory location and use the narrowband output to feed the SBEC. Not sure if this is causing it to read improperly or I have another issue.

    At idle, it reads 11-12 AFR
    At cruising, it reads 13.5-14.2
    At WOT, it dives to 10, the lowest the gauge will read.

    The car feels fine and as fast as usual, so I'm a little perplexed on it.

    Thoughts?

  2. #2
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Wideband installed, seems to run a bit rich

    Are you sure you have it properly set up in MPTune for your cal?
    Although that won't change what the wideband reads on its own display.
    But you should make sure you have the correct min/max on the WB2NB function.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
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    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
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  3. #3
    Hybrid booster
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    Re: Wideband installed, seems to run a bit rich

    Actually running stock electronics. The wideband has a narrowband output.

  4. #4
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Wideband installed, seems to run a bit rich

    Sorry, I guess I misread!
    The at idle AFR is after the engine is fully warmed/the fan has cycled on?
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.7786@113.04 mph! - Jan 15th, 2017 Fayetteville Dragway, NC)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  5. #5
    Supporting Member II Turbo Mopar Contributor tryingbe's Avatar
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    Re: Wideband installed, seems to run a bit rich

    Grounding at battery?

  6. #6
    Hybrid booster
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    Re: Wideband installed, seems to run a bit rich

    Yes, readings taken after fan cycled on.

    Not grounded at the battery, grounded to chassis under the dash where the controller box is mounted.

  7. #7
    Supporting Member II Turbo Mopar Contributor tryingbe's Avatar
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    Re: Wideband installed, seems to run a bit rich

    Ground it to the battery and see.

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