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Thread: Help: Stock 2015 Mustang 5.0 goes lean and wont run. Log included

  1. #1

    Help: Stock 2015 Mustang 5.0 goes lean and wont run. Log included

    Im trying to figure out whats wrong with my buddies 2015 GT 5.0. Its 100% stock, only have free flowing factory pussy cats.

    Currently it started to to full lean and stops running and we cant figure it out. Does anyone have any suggestions>?



    2015 mustang street.hpl

    2015 Mustang 5.0 lean (Rev 0).hpt

  2. #2
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    Quote Originally Posted by regorih View Post
    Im trying to figure out whats wrong with my buddies 2015 GT 5.0. Its 100% stock, only have free flowing factory pussy cats.

    Currently it started to to full lean and stops running and we cant figure it out. Does anyone have any suggestions>?



    2015 mustang street.hpl

    2015 Mustang 5.0 lean (Rev 0).hpt
    I would check the MASS AIRFLOW meter and throttle body, make sure they are clean no oil residue, dirt ect. there should be no reason for 65% STFT if the car is absolutely stock except for the cats. Cats would not make a huge change like that.

  3. #3
    Advanced Tuner small tuner's Avatar
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    Bad fuel pump
    Turbocharged COYOTE

    PM for E tune / Remote Tuning session

  4. #4
    I swapped the mass air censor with no change .

    Small tuner, I will be looking at the pump now. Do you know a good way to monitor the fuel pressure?

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    Quote Originally Posted by regorih View Post
    I swapped the mass air censor with no change .

    Small tuner, I will be looking at the pump now. Do you know a good way to monitor the fuel pressure?
    pressure drop across the injectors, fuel rail pressure sensor