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Vovlo codes and truck issues

Discussion in 'Volvo Forum' started by ThreeM, Jul 10, 2017.

  1. Jul 10, 2017 #1
    ThreeM

    ThreeM Light Load Member

    56
    1
    Mar 30, 2014
    0
    Problem with my 1998 Volvo VNL, Cummins M11:
    Just after fueling the other day truck started vibrating while at low speed and accelerating.
    After gaining some speed the vibration stops.
    Couple of hour later the yellow warning light comes up with only 3 codes:
    MID 128
    PID 84
    FMI 10.
    Pulled over, started the truck again, clear the codes, no warning this time but the computer is now showing wrong fuel usage (it's showing 5.9mpg on average while I usually get 7).
    It is only the computer that is showing it wrong, the actual fuel usage is still the same so I wonder if something might be wrong with the computer itself?

    P.S. Truck is still vibrating at idle and low speeds.

    Any ideas where should I start?
     
    Last edited: Jul 10, 2017
    ThreeM, Jul 10, 2017
    ThreeM, Jul 10, 2017
    #1
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  3. Jul 10, 2017 #2
    kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

    10,916
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    Jan 13, 2013
    SW Arkansas
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    Bad fuel? Have you put any fuel in since then?
     
    kemosabi49, Jul 10, 2017
    kemosabi49, Jul 10, 2017
    #2
    CoyoteExpress Thanks this.
  4. Jul 10, 2017 #3
    ThreeM

    ThreeM Light Load Member

    56
    1
    Mar 30, 2014
    0
    I was wondering the same. Only got another 80 gal after that ( from a different place for sure) but I don;t see a difference so far.
     
    ThreeM, Jul 10, 2017
    ThreeM, Jul 10, 2017
    #3
  5. Jul 10, 2017 #4
    baha

    baha Road Train Member

    4,137
    2,837
    Jul 25, 2013
    ga
    0
    Have you changed your fuel filters yet you may need to buy some extra filters an keep them in tool box till bad fuel runs thru?
     
    baha, Jul 10, 2017
    baha, Jul 10, 2017
    #4
    CoyoteExpress Thanks this.
  7. Jul 11, 2017 #5
    CoyoteExpress

    CoyoteExpress Medium Load Member

    367
    174
    Oct 29, 2014
    Carlingford NB Canada
    0
    HOw high is the fuel in the glassfilter???
     
    CoyoteExpress, Jul 11, 2017
    CoyoteExpress, Jul 11, 2017
    #5
  8. Jul 11, 2017 #6
    shogun

    shogun Road Train Member

    6,075
    72,161
    Jan 23, 2009
    Doing a regen
    0
    Google shows that code to be an erratic rode speed fault which may be an issue with the speed sensor on the tail of the transmission. The vibration at idle is a little trickier, can be several things, but a fuel filter issue usually rears its head under a load, just like an injector miss. You could use a temp gun and shoot the exhaust ports to make sure all the injectors are firing, the cold one is going to be missing, or run an injector cut out test with a laptop.
     
    shogun, Jul 11, 2017
    shogun, Jul 11, 2017
    #6
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