Can one bad injector be causing this 3 to 3.5 MPG?

Discussion in 'Ask An Owner Operator' started by joseh8772, Sep 30, 2012.

  1. joseh8772

    joseh8772 Bobtail Member

    Jun 12, 2010
    Bentonville AR
    Ok i just got it this truck about 2 weeks ago and yesterday i took for about 140 miles round trip run and i only was getting about 3 to 4 mpg i took to dealer and they told me the injector #6 is bad can this realy be the problen? The truck is a volvo 2004 with a volvo engine
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  3. freightlinerman

    freightlinerman Road Train Member

    Mar 4, 2011
    It could be, I couldn't tell you. Some people just don't have any luck with Volvo. Try to replace it and see, I believe you can disable EGR, you may look into that too. Some people report good fuel mileage, but you have issues. Check your fuel and air filters, replace your muffler, do an over head. Then, go from there.
  4. snowwy

    snowwy Road Train Member

    Jul 6, 2009
    if they say the injector is bad. i certainly wouldn't keep driving it with a bad part. you're only going to end up with more problems. and kicking yourself in teh butt for not fixing what was wrong in the first place.

    if your getting low mileage. i'm guessing your buring up a lot of fuel. which means diluting the oil inside the engine. and that's not good for the engine.

    from what i've seen of my muffler. i put a high flow on. and the inside is really no different then the muffler i pulled off. it's basically a hollow casing. only difference is the high flow is shorter. therefore a little noise compared to quiet. but certainly nothing in there to get plugged up. causing an exhaust restriction.

    i figured my muffler would have been clogged from all the smoke i was blowing from the dead turbo. but the muffler was totally empty of soot.

    air filters can decrease mileage but they'd have to be totally plugged off to see that low of mileage. my w9 had a dead turbo and i was down to 4.5. i'm up to 5.5 with the turbo and muffler and air filters. finally got the oil changed from a dead turbo and now i'm up to 5.9.

    but that's over on the east. i'm back in the mountains now. i'm expecting to see 5.5 now.
  5. Mr. PlumCrazy

    Mr. PlumCrazy Road Train Member

    Jul 30, 2009
    Lexington NC
    dont know about 3-4 but i can tell you it will make you loose over 2 mpg
  6. MNdriver

    MNdriver Road Train Member

    Feb 24, 2012
    I'd go in and put in a complete set of 6.

    If the one is dead, how soon before the other 5 start giving you fits as well.
  7. joseh8772

    joseh8772 Bobtail Member

    Jun 12, 2010
    Bentonville AR
    I just replace the air filter and fuel filters freightlinerman
  8. joseh8772

    joseh8772 Bobtail Member

    Jun 12, 2010
    Bentonville AR
    Thank you every one for the replies.i hope the injector is the only problem because when i did the diagnoctics it said it was an electrical fault with the injector #6 it did not said it was a bad injector but the dealer said the injector is bad
  9. BigCam9670

    BigCam9670 Medium Load Member

    Jun 12, 2012
    Hudson, NY
    Probably an open in the injector coil. Is it skipping? If it is a dead injector, I would think you would hear the miss. And yes, it probably would get terrible fuel mileage.
  10. jbatmick

    jbatmick Road Train Member

    Dec 1, 2009
    hastings, Fl
    Take one of those temperature guns and check the exhaust temperature on the exhaust manifold at that cylinder. If it is much cooler than the other 5, bad injector.
  11. dannythetrucker

    dannythetrucker Road Train Member

    May 26, 2011
    everywhere, man
    Don't make a harsh judgement on 140 miles results. Give it 1,000 or so to make sure.
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