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bad mileage help

Discussion in 'Performance and Tuning' started by tisher49, Mar 3, 2011.

  1. Mar 3, 2011 at 7:37 AM
    #1
    tisher49

    tisher49 [OP] Well-Known Member

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    Alex
    Orange, Virginia
    Vehicle:
    '08 4.0L 4x4
    K&N Air Filter, Westin Bull Bar with PIAA fog lights, Retrax cover, Alpine Head unit with I-Pod interface, maglite mount, Color matched grill surround w/ Grillcraft mesh
    This past July I put a jardine cat back exhaust on my truck. I wasn't looking for much performance gain but mostly for sound. Surprisingly I found that I got a bit of a mileage boost until recently.

    What I have noticed recently is that the truck feels a like it has less "oomph" at the low to mid range rpms and I have to keep it around 2900 3000 rpms to keep the truck at a constant speed. I started putting in 89 thinking this might help and it seemed to for a while but now it is back to feeling weaker again. The exhaust sound has also seemed to get a little louder. Any ideas what the issue is here? I also have a TRD CAI with an AFE Pro Dry filter. As I recall from last time I was under the truck the exhaust was bolted on not welded. Is it possible that it has loosened up and I need to tighten it and or get it welded? Thanks in advance for any help.
     
  2. Mar 3, 2011 at 7:50 AM
    #2
    jdtemple

    jdtemple Well-Known Member

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    Lift & Tires, in cab power outlets, Locking Bed Boxes, K&N
    Whats your milage, have you changed your plugs, computer throwing any codes, right foot get heavier, driving on snow/ice, tried a different gas station?
     
  3. Mar 3, 2011 at 7:50 AM
    #3
    808matt

    808matt Well-Known Member

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    exhaust leak
     
  4. Mar 3, 2011 at 10:26 AM
    #4
    tisher49

    tisher49 [OP] Well-Known Member

    Joined:
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    Alex
    Orange, Virginia
    Vehicle:
    '08 4.0L 4x4
    K&N Air Filter, Westin Bull Bar with PIAA fog lights, Retrax cover, Alpine Head unit with I-Pod interface, maglite mount, Color matched grill surround w/ Grillcraft mesh
    mileage is at best 18 highway and depending where I'm at on regular roads any where from 13-16. Haven't changed any plugs, computer isn't throwing any codes, in VA so not much snow/ice driving and I try to use the same gas station every time (but I did move from NY to VA in august, maybe gas composition is different down here?).

    In terms of my foot being heavy, I've noticed that if I accelerate quickly through the lower rpms I seem to get a better avg mpg since I am at the lower rpms for a shorter amount of time. This hypothesis seems correct but please correct me if im wrong.
     
  5. Mar 3, 2011 at 10:26 AM
    #5
    tisher49

    tisher49 [OP] Well-Known Member

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    Alex
    Orange, Virginia
    Vehicle:
    '08 4.0L 4x4
    K&N Air Filter, Westin Bull Bar with PIAA fog lights, Retrax cover, Alpine Head unit with I-Pod interface, maglite mount, Color matched grill surround w/ Grillcraft mesh
    is there a way to check this or do I need to have it welded and then see if I notice a difference?
     
  6. Mar 3, 2011 at 6:05 PM
    #6
    808matt

    808matt Well-Known Member

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    welding is not needed. just go from the headers and work your way down to the exhaust tip. its not the easiest thing to find but it could be as simple as a gasket replace or tightening a bolt.
     
  7. Mar 3, 2011 at 6:43 PM
    #7
    no mods

    no mods Well-Known Member

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    Nobody mentioned a dirty MAF
     
  8. Mar 3, 2011 at 7:14 PM
    #8
    tisher49

    tisher49 [OP] Well-Known Member

    Joined:
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    Alex
    Orange, Virginia
    Vehicle:
    '08 4.0L 4x4
    K&N Air Filter, Westin Bull Bar with PIAA fog lights, Retrax cover, Alpine Head unit with I-Pod interface, maglite mount, Color matched grill surround w/ Grillcraft mesh
    and what am I looking for exactly? Just any space that could be leaking exhaust?
     
  9. Mar 3, 2011 at 7:15 PM
    #9
    tisher49

    tisher49 [OP] Well-Known Member

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    Alex
    Orange, Virginia
    Vehicle:
    '08 4.0L 4x4
    K&N Air Filter, Westin Bull Bar with PIAA fog lights, Retrax cover, Alpine Head unit with I-Pod interface, maglite mount, Color matched grill surround w/ Grillcraft mesh
    hmm I remember reading somewhere that they mentioned doing that after installing the TRD CAI and I don't believe I did it then. At almost 60,000 I'm guessing that should be an option I consider. Even if it's not the fix it won't hurt right?
     
  10. Mar 4, 2011 at 5:47 AM
    #10
    no mods

    no mods Well-Known Member

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    Correct, just be carefull not to damage sensor

    excuse my misspellings, reply sent from my phone.
     
  11. Mar 4, 2011 at 7:20 PM
    #11
    tisher49

    tisher49 [OP] Well-Known Member

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    Alex
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    Vehicle:
    '08 4.0L 4x4
    K&N Air Filter, Westin Bull Bar with PIAA fog lights, Retrax cover, Alpine Head unit with I-Pod interface, maglite mount, Color matched grill surround w/ Grillcraft mesh
    any one got any other ideas? Or maybe someone who has had the same thing happen and found a solution
     
  12. Mar 5, 2011 at 4:35 AM
    #12
    no mods

    no mods Well-Known Member

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    Clean Maf, change air filter, replace sparkplugs, run injector cleaner, inflate tires and get a more scientific means for monitoring fuel mileage. Not to mention Fuel formulas from winter and summer are always changing too. With out a proper means to record driving habbits and other extranious variables its hard to tell what's going on at ur end.
     
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