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Mxs backfiring /popping exhaust

Discussion in 'Trucks [ Eighteen Wheelers ]' started by barbwire625, Dec 31, 2013.

Page 2 of 3
  1. Jan 8, 2014 #11
    Gear head

    Gear head Medium Load Member

    532
    91
    Apr 1, 2012
    Belair,md
    0
    No codes normally it will through a code for low vva pressure.
     
    Gear head, Jan 8, 2014
    Gear head, Jan 8, 2014
    #11
    barbwire625 Thanks this.
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  3. Jan 8, 2014 #12
    morehp

    morehp Medium Load Member

    699
    206
    Jun 18, 2012
    0
    I have seen them with housings snapped and Iva solenoid hanging from the wires, no oil press codes logged just a code for the solenoid.
     
    morehp, Jan 8, 2014
    morehp, Jan 8, 2014
    #12
    barbwire625 Thanks this.
  4. Jan 8, 2014 #13
    Gear head

    Gear head Medium Load Member

    532
    91
    Apr 1, 2012
    Belair,md
    0
    Yes me too but there is always a code because of the abnormal oil pressure when the ecm trys to activate the iva.
     
    Gear head, Jan 8, 2014
    Gear head, Jan 8, 2014
    #13
    barbwire625 Thanks this.
  5. Jan 10, 2014 #14
    JohnP3

    JohnP3 Road Train Member

    1,594
    683
    Feb 21, 2010
    Rock Creek B.C. Canada
    0
    Broken injector springs, broken valve spring usually intake, or the IVA.
    Just a thought!
     
    JohnP3, Jan 10, 2014
    JohnP3, Jan 10, 2014
    #14
    barbwire625 Thanks this.
  7. Jan 11, 2014 #15
    manasteel

    manasteel Light Load Member

    124
    32
    Sep 10, 2012
    0
    If I remember right, seems like some of the mxs had an issue with cam sensor gap being to close, and needed to be shimmed out.
     
    manasteel, Jan 11, 2014
    manasteel, Jan 11, 2014
    #15
    barbwire625 Thanks this.
  8. Jan 11, 2014 #16
    barbwire625

    barbwire625 Bobtail Member

    11
    3
    Aug 10, 2012
    Whitwell, TN
    0
    Thanks, no broken springs or anything. And the cat dealers around me can't find anything wrong. Waiting for a chance to get on a dyno. Maybe replicate the problem, I hope!
     
    barbwire625, Jan 11, 2014
    barbwire625, Jan 11, 2014
    #16
  9. Dec 28, 2014 #17
    possum42

    possum42 Bobtail Member

    2
    0
    Dec 28, 2014
    0
    So what was the final diagnosis? I've had the exact same issue for a couple years now.
     
    possum42, Dec 28, 2014
    possum42, Dec 28, 2014
    #17
  10. Feb 14, 2015 #18
    Oscar the KW

    Oscar the KW Going Tarpless

    12,246
    28,114
    May 19, 2011
    0
    I have a 625 NXS doing this intermittently, ever figure out what it was?
     
    Oscar the KW, Feb 14, 2015
    Oscar the KW, Feb 14, 2015
    #18
  11. Feb 14, 2015 #19
    barbwire625

    barbwire625 Bobtail Member

    11
    3
    Aug 10, 2012
    Whitwell, TN
    0
    I had a valve that was wearing into the head. It took 5 shops to figure it out. Ran over head at I27 repair in Amarillo. Took him like 2 seconds to see that one valve was 1/4" taller than all the others
     
    barbwire625, Feb 14, 2015
    barbwire625, Feb 14, 2015
    #19
    possum42, cat from the valley and Oscar the KW Thank this.
  12. Feb 19, 2015 #20
    possum42

    possum42 Bobtail Member

    2
    0
    Dec 28, 2014
    0
    Not the good news I was hoping to get but, at least now I know what to look for come spring. Thanks!
     
    possum42, Feb 19, 2015
    possum42, Feb 19, 2015
    #20
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