Colder = Leaner?

Discussion in 'F/I Mods & Tuning' started by NHXRUNNER, Nov 17, 2017.

  1. NHXRUNNER

    NHXRUNNER "New Hampster"
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    Is AFR calibrated to a certain ambient temperature? I don't remember going lean last winter. But since the weather has shifted into the low 30s and 20s all of a sudden I'm seeing 12s in boost and I find myself staying out of boost now. Is it normal? I'm running the 2.825 pulley and no FPR mod....

    Could it be related to a plugged up fuel filter? I did the fuel pump upgrade just prior to installing the blower (1.5 yrs ago) and haven't ever changed it.

    Thoughts?
     
  2. autobodyX

    autobodyX Member

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    Changing the filter would be a good place to start. I see a lot of complaints this time of year, many times it’s summer blend gas in cold weather. Do you have fresh fuel in the tank?
    I had trouble with the fuel hose in the tank cracking. The Leak slowly got worse, and truck got hard to start, lost power,and run lean.
    If you notice the engine spins over longer before starting, that would point at a cracked line.
     
  3. NHXRUNNER

    NHXRUNNER "New Hampster"
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    Fresh fuel, no hard start issues, no lost power....I threw in the FPR mod and my AFRs fattened right up. Hopefully I can pull that off once I get the filter replaced.

    What should I be looking for in fuel trims? And what will that tell me?
     
  4. wolfpack_5150

    wolfpack_5150 Jangley

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    Lmao, yeah i notice a large lack in mileage whenever i try the boost reference (sometimes i try different things in diff weather or if im hitting large elevation changes). I mean u never know unless u try, plus we all like to tinker right?

    With boost referencing i went from 11 or 12s to a rock steady 10 or maybe lower (gauge only sees 10:1) with the boost reference. Def lost some get up and go.... felt like the truck was drowning in fuel

    That said, in about 30k miles i dumped some nasty fuel out of my fuel filter (the one from urd). It was dark, with alot of sediment on the bottom of the glass i poured it in.

    .
     

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