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Primary & Secondary air gauge issues, bouncing

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by REELLO, Jul 16, 2017.

  1. Jul 16, 2017 #1
    REELLO

    REELLO Bobtail Member

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    Jul 16, 2017
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    I have a 2010 PROSTAR w/ ISX Cummings engine. Recently had the air comp replace a year ago and recently, the main air line off the comp replaced. Now my primary and secondary air pressure gauges are bouncing around. I have air pressure the governor kicks in and seems to be working fine, yet the gauges , not at the same time will go up in pressure to alarm state then back to normal or swing the opposite way....I need help?
     
    REELLO, Jul 16, 2017
    REELLO, Jul 16, 2017
    #1
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  3. Jul 16, 2017 #2
    RET423

    RET423 Medium Load Member

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    Apr 6, 2017
    Kalifornia
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    It sounds like you have electric air pressure gauges that are failing or their sending unit's are failing; Manual gauges don't jump around.
     
    RET423, Jul 16, 2017
    RET423, Jul 16, 2017
    #2
  4. Jul 16, 2017 #3
    REELLO

    REELLO Bobtail Member

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    Jul 16, 2017
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    The pressure senor was replaced 4 days ago same issue. Could it be compressor issues?
     
    REELLO, Jul 16, 2017
    REELLO, Jul 16, 2017
    #3
  5. Jul 16, 2017 #4
    Heavyd

    Heavyd Road Train Member

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    Air compressors do not cause wild air pressure swings. You still have gauge issues. Both primary and secondary gauges are feed data from the body controller which reads from pressure sensors. If you have a brake application pressure gauge, see if it is also acting weird as all three sensors share the same 5 volt reference from the body controller. If not, I would say you still have a wiring or body controller issue.
     
    Heavyd, Jul 16, 2017
    Heavyd, Jul 16, 2017
    #4
    RET423 Thanks this.
  7. Apr 1, 2018 #5
    Pmarrero88

    Pmarrero88 Bobtail Member

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    Feb 13, 2018
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    I’m having the same issue did you ever figure out the issue????
     
    Pmarrero88, Apr 1, 2018
    Pmarrero88, Apr 1, 2018
    #5
  8. May 29, 2018 #6
    Byonata

    Byonata Bobtail Member

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    Apr 29, 2016
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    My primary air gauge drops down when I accelerate... The more when I accelerate longer to the point when it drops from 120 to 90, both air gauges will point to 6o clock and buzzer beeps... It'll stop about 5 to 10 seconds of me coasting... Air app gauge acts like the boost gauge. (Needle moves exactly like the boost gauge needle)... Pretty sure I have BCM problem...
     

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    Byonata, May 29, 2018
    Byonata, May 29, 2018
    #6
  9. May 29, 2018 #7
    Oldironfan

    Oldironfan Road Train Member

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    May 22, 2017
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    Those legendary Cummings engines do not seem to build air when they should.
     
    Oldironfan, May 29, 2018
    Oldironfan, May 29, 2018
    #7
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