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ACTUAL A/F Ratio 15.94 most of the time

Discussion in 'FAST Support Forum' started by Diego Garcia, Aug 29, 2017.

  1. Diego Garcia

    Diego Garcia New Member

    Joined:
    Apr 27, 2016
    Location:
    Buenos Aires, Argentina
    Hi, I'm new at FAST and I installed my first FAST XFI Kit a couple a months ago in a GEN III 426 HEMI. After read all the available documentation and make a lot of adjustments, I got the engine idleing. My problem is even when the ACTUAL A/F ratio is stucked at 15.94 when the engine is idleing, it's smells too reach. When I accelerate the ACTUAL A/F changes. Any clue?

    PD. Sorry for my english, I'm from Argentina.
     

    Attached Files:

  2. A A

    A A Well-Known Member

    Joined:
    Jun 22, 2014
    It seems you may have a false lean condition. Header leaks are the likely cause.
     
  3. Diego Garcia

    Diego Garcia New Member

    Joined:
    Apr 27, 2016
    Location:
    Buenos Aires, Argentina
    Thanks, I'll check it and let you know in couple of days. Thanks again.
     
  4. A A

    A A Well-Known Member

    Joined:
    Jun 22, 2014
    You might also be getting exhaust air inversion if you aren't running a full exhaust.
     
  5. Diego Garcia

    Diego Garcia New Member

    Joined:
    Apr 27, 2016
    Location:
    Buenos Aires, Argentina
    Do you know any procedure to check the O2 Sensor? Is there any way to check that it isn't broke or is malfunctioning?
     
  6. A A

    A A Well-Known Member

    Joined:
    Jun 22, 2014
    A new sensor is likely fine. It is giving readings. if you think there is a problem with it, the best course is to replace it.

    Do you have a complete exhaust system to the rear of the vehicle?
     
  7. Diego Garcia

    Diego Garcia New Member

    Joined:
    Apr 27, 2016
    Location:
    Buenos Aires, Argentina
    Yes, I have it. OK, I will replace the O2 Sensor as you suggest. I wanted to avoid buying a new sensor and then realize that it wasn't the root-cause, but at this point I understand that is the simplest path. Thanks.
     
  8. A A

    A A Well-Known Member

    Joined:
    Jun 22, 2014
    You know there are two types of Wideband O2 sensor? Did you complete setup as described in 6.0 of the C-COM software?
     
  9. Fastmanefi

    Fastmanefi Active Member

    Joined:
    Jun 4, 2011
    Location:
    Sonora, CA
    Flow a little propane gas (UNLIT) over the sensor. The AF should read way down into the nines.
     
  10. Diego Garcia

    Diego Garcia New Member

    Joined:
    Apr 27, 2016
    Location:
    Buenos Aires, Argentina
    I changed OS2 Sensor today and the new one is reading ok. Thanks all for your help.
     

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