Time for a tuneup??

Discussion in 'Trucks [ Eighteen Wheelers ]' started by The blue guy, Mar 5, 2015.

  1. The blue guy

    The blue guy Light Load Member

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    Its way over due, but its time for a tuneup. 2004 freightliner century, detroit series 60 12.7. Ddec 5.
    Its really running like #####! It misfires as its rolling, and it seems te best I can do for fuel mileage is 4.0mpg.
    No smoke or Anything like that.
    any thing you can think of why im getting such ###### gas mileage.
    I will replace my fuel pump and all my injectors too when they do the tuneup.
    What kind of improvement should i expect from a tune up? What are some of your improvements that you saw in yours?
     
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  3. little cat 500

    little cat 500 Road Train Member

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    prolly the egr acting up but should do a tune up around 100000 miles
     
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  4. GrapeApe

    GrapeApe Road Train Member

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    How many miles since you ajusted the overhead? The intakes tighten up on those and if it's way overdue, they may be way too tight. I'd check the EGR for issues and run the overhead 1st. Injectors may be a waste of money right now, find the problem first.
     
  5. The blue guy

    The blue guy Light Load Member

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    Jan 4, 2015
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    The truck has 840k. I just replaced the egr valve 5k miles ago
     
  6. little cat 500

    little cat 500 Road Train Member

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    egr's on these motors don't last prolly the valve adjustments tight has it ever been set
     
  7. The blue guy

    The blue guy Light Load Member

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    Jan 4, 2015
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    Do you mean the valve inside the egr valve? That has to be adjusted if its too tight?
     
  8. Prom Night Dumpster Baby

    Prom Night Dumpster Baby Medium Load Member

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    To be nit picky, it's the bridges you adjust, not the valves themselves.
     
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  9. GrapeApe

    GrapeApe Road Train Member

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    Not to be picky, but S60's don't have valve bridges, each valve has it's own adjusting screw in the rockers. :)
     
  10. Righand81

    Righand81 Bobtail Member

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    Grape you took the words out of my mouth!
     
  11. 1johnb

    1johnb Medium Load Member

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    How many bridges have you adjusted on a sixty series?
    The over head on a detroit is the most difficult thing to do on one. In comparison with cat & Cummins. No experience on the Mercedes or vulvas I got lucky and didn't have the shims to set up the compression brake. It went to the dealer.
     
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