poor mileage,black smoke

Discussion in 'Peterbilt Forum' started by Sodapop, Jun 2, 2022.

  1. Sodapop

    Sodapop Light Load Member

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    Mar 19, 2010
    Blytheville,Ar
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    2004 379, c14 cat .mbn....ecm redone,,borg warner turbo..1.7 mill miles.fuel mileage way done,truck runs sluggish..when i run west tx,nm and Az truck smokes more when i change gears..I thought it was the cac..just got it checked all good..but putting a new one on..12 years old..turbo seems slow on spooling up...
    I'm at a stand still on what to check next....
     
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  3. baha

    baha Road Train Member

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    Have you been to a cat shop and had the injectors ck. May have 1 or more over fueling?
     
  4. Sodapop

    Sodapop Light Load Member

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    Mar 19, 2010
    Blytheville,Ar
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    no sir,...i did talk to a cat dealer..and he told me since i altered engine they couldnt work on it....he was nice about it though..With that said I had an older cat mechanic tell me with that many miles i needed a new set ...
     
  5. AModelCat

    AModelCat Road Train Member

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    Sadly most dealers are clueless if everything hasn't been left in stock form.
     
  6. pumpkinishere

    pumpkinishere Heavy Load Member

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    Apr 21, 2021
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    Do any of you use that additive you put in the fuel to help keep injectors clean?
     
  7. pumpkinishere

    pumpkinishere Heavy Load Member

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    We haven’t used it on our truck but was wondering if maybe we should. We have a 2016 Pete.
     
  8. lester

    lester Road Train Member

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    Personally inthink a little fuel additive is good now and then. Fuel is so dry a little extra lubricity is good. I run 2 stroke oil every now and then, not sure if that would be okay with an emissions truck.
    As for the original post, check turbo and piping for leaks. Changed air filters or fuel filters? And cat refusing to look at it because it's been altered? What a crock of poo. A different turbo and tune on a pre emissions engine gimme a fricking break, procedure is still the same. That really ticks me off. I could understand if it was an emissions motor that had been deleted but a 18 year old pre emissions come on
     
  9. lester

    lester Road Train Member

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    I like my cat engine but absolutely despise cat dealers
     
  10. baha

    baha Road Train Member

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    O yea a slightly clogged air cleaner can make a lot of smoke, charging it out with a new one is 1st step?
     
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