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Governor issue?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Svoray, May 16, 2011.

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  1. May 16, 2011 #1
    Svoray

    Svoray Medium Load Member

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    Feb 3, 2011
    Texas
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    I'm not sure if I have a governor issue or what. On a good day my work truck will do 65/70 mph which is the speed limit in my surrounding hwys. Anyhow, here lately I've been having issues just doing 55-60mph. The other day I made a run from Pecos Tx to Midland Tx (90m miles) and couldn't do any faster than 60mph...even on a down slope. The truck maintained this speed in 10th gear # 1500rpms. Then one time I could only get it to do 45mph in a 70mph zone at 1500rpms and in 9th gear. I'm not looking to speed but at least do the speed limit as not to get ran over. One thing I noticed is I do get a flashing amber dash light when this happens...it's not a check engine light.

    We did a PM ( change oil and filters) but no luck.
     
    Svoray, May 16, 2011
    Svoray, May 16, 2011
    #1
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  3. May 16, 2011 #2
    vadim2200

    vadim2200 Light Load Member

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    Nov 21, 2010
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    its not the Governor. So from what you are saying when you are in 10th gear your truck only runs 45? Also you said "couldn't do any faster than 60mph...even on a down slope" is your engine break on? And from what i seen: some trucks do go 45mph in 9th gear depending on what trans you got. Got to give more specifics...
     
    vadim2200, May 16, 2011
    vadim2200, May 16, 2011
    #2
  4. May 16, 2011 #3
    05chopper

    05chopper Light Load Member

    169
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    Dec 25, 2008
    USA
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    Work truck? Fill us in more info?
     
    05chopper, May 16, 2011
    05chopper, May 16, 2011
    #3
  5. May 17, 2011 #4
    AUSSIE DAVE

    AUSSIE DAVE Road Train Member

    1,032
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    Feb 21, 2010
    OZ - Brisbane
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    could also be brakes not releasing 100% check for air leaks, and wear in brake system
     
    AUSSIE DAVE, May 17, 2011
    AUSSIE DAVE, May 17, 2011
    #4
    end of the road Thanks this.
  7. May 17, 2011 #5
    KnuckleBuster

    KnuckleBuster Light Load Member

    206
    189
    Jun 20, 2010
    Wellsboro Pa, Lakeland Fl
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    Seeing how it will limit RPMs to 1500, it sounds as if the engine is derating or going into the "limp home" mode and limiting power and RPMs. Probably a dirty or bad speed sensor.
     
    KnuckleBuster, May 17, 2011
    KnuckleBuster, May 17, 2011
    #5
  8. May 17, 2011 #6
    Heavyd

    Heavyd Road Train Member

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    Make, model, year of truck and engine please!
     
    Heavyd, May 17, 2011
    Heavyd, May 17, 2011
    #6
  9. May 17, 2011 #7
    Svoray

    Svoray Medium Load Member

    558
    194
    Feb 3, 2011
    Texas
    0
    Sorry,

    It's a 94' Pete Bobtail fuel tanker (twin rear axles). Now this limit on toms and loss of power or mph doesn't happen all the time. I was able to do 65mph to work today no problem.
     
    Svoray, May 17, 2011
    Svoray, May 17, 2011
    #7
  10. May 17, 2011 #8
    Hardlyevr

    Hardlyevr Road Train Member

    3,270
    2,540
    Jul 30, 2009
    Mapleton Depot,PA
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    so what light is it that is flashing?
     
    Hardlyevr, May 17, 2011
    Hardlyevr, May 17, 2011
    #8
  11. May 17, 2011 #9
    Heavyd

    Heavyd Road Train Member

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    Start with the cheap and easy stuff. Change your fuel filters. Check your air filters.
     
    Heavyd, May 17, 2011
    Heavyd, May 17, 2011
    #9
  12. May 17, 2011 #10
    05chopper

    05chopper Light Load Member

    169
    22
    Dec 25, 2008
    USA
    0
    Worthless thread! I guess we should assume your truck engine is WHAT?
     
    05chopper, May 17, 2011
    05chopper, May 17, 2011
    #10
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