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Thread: afr running high

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  1. #1
    Join Date
    Nov 2008
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    savannah ga
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    afr running high

    I just put this vaccum line didtribution block on my truck to run wastegate, bov, etc... took the truck for a spin and at wide open throttle pulls low 11s and then all the sudden jumps to like high 15s, what would cause this,, nick
    Master power t-76 kbracing, Intercooled, 11psi, tr220 cam, patriot dual springs, 72lbrs, snow meth, walbro, efans, 80e, tansgo, yank 3200.

  2. #2
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    Either your 02 sensor is bad or your MAF is contaminated. Both have happened to me.

    ~ Forged engine of some type ~ Ball bearing turbo of an unconfirmed size ~ 4L8000 trans ~ Beefy fuel system ~

  3. #3
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    Nov 2008
    Location
    savannah ga
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    would a obd scanner tell if the maf was bad I no it should tell me if the o2 is bad
    Master power t-76 kbracing, Intercooled, 11psi, tr220 cam, patriot dual springs, 72lbrs, snow meth, walbro, efans, 80e, tansgo, yank 3200.

  4. #4
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    Nov 2008
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    and another ? is the rear o2s the same as the front since I am not using them anymore could just swap out
    Master power t-76 kbracing, Intercooled, 11psi, tr220 cam, patriot dual springs, 72lbrs, snow meth, walbro, efans, 80e, tansgo, yank 3200.

  5. #5
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    The OBD II will not tell you if the MAF is bad. I had to remove it, clean it and put it back in. As for the 02 sensor, it depends on what wideband you have. I know my AEM uses a Bosch wideband 02 sensor. The front and rear 02 sensors are different - upstream and downstream. Your best bet would be to find out exactly which 02 sensor your wideband kit uses and replace it. My wideband 02 sensor only lasted about a year.

    ~ Forged engine of some type ~ Ball bearing turbo of an unconfirmed size ~ 4L8000 trans ~ Beefy fuel system ~

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