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2012 ProStar+ Increases RPMs When Idle

Discussion in 'International Forum' started by Arkevius, Oct 24, 2013.

  1. Oct 24, 2013 #1
    Arkevius

    Arkevius Bobtail Member

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    Oct 24, 2013
    0
    I have a 2012 ProStar+ with MaxxForce engine. When I'm parked and idle, every 3 minutes (on the dot) the truck will increase RPMs until just below 1500. The clutch, brake, or fuel pedal must be pressed to bring the RPMs back down to idle (600). Then after another 3 minutes, the process starts over.What could be causing this behavior?
     
    Arkevius, Oct 24, 2013
    Arkevius, Oct 24, 2013
    #1
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  3. Oct 24, 2013 #2
    rbrtwbstr

    rbrtwbstr Road Train Member

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    in the bush somewhere
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    Its pretty common. They do that to keep the exhaust temp high, reducing soot, which blocks the dpf
     
    rbrtwbstr, Oct 24, 2013
    rbrtwbstr, Oct 24, 2013
    #2
    paul_4lp and Charli Girl Thank this.
  4. Oct 24, 2013 #3
    EZ Money

    EZ Money Road Train Member

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    The East Side Gang,Charlotte,NC.
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    Man,That would get annoying.
    My old ProStar was a Cummins powered 2012.....never had that issue.
    It may be worth asking the dealer about it.

    Does the exhaust temp light come on when it does this?

    I bet HeavyD would know the answer
     
    EZ Money, Oct 24, 2013
    EZ Money, Oct 24, 2013
    #3
  5. Oct 24, 2013 #4
    Heavyd

    Heavyd Road Train Member

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    The engine just does this to keep warm. If it senses temperatures under 50 degrees it ramps up the RPM to 1500. The current generation of engines have twice the cooling capacity they used to with all the EGR coolers and what not. It takes a lot more to get the engine up to temp if it is just at idle.
     
    Heavyd, Oct 24, 2013
    Heavyd, Oct 24, 2013
    #4
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  7. Oct 24, 2013 #5
    Arkevius

    Arkevius Bobtail Member

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    Oct 24, 2013
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    No, the high temp light does not come on when this happens.

    This makes sense though (what heavyd said), but I wanted another's opinion that has more knowledge in this area than I do. At first I thought it may just have been because we had the heat on, and it was trying to keep the engine warm so they air can heat up. Then again, that may not even be how all that works, for all I know, haha.

    Thank you everyone for the replies!
     
    Arkevius, Oct 24, 2013
    Arkevius, Oct 24, 2013
    #5
  8. Oct 24, 2013 #6
    Denominator

    Denominator Bobtail Member

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    Oct 23, 2013
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    Just make sure to take it in if the engine starts to idle up higher than 2000 or starts to use oil.
     
    Denominator, Oct 24, 2013
    Denominator, Oct 24, 2013
    #6
  9. Dec 25, 2013 #7
    Ysofast

    Ysofast Bobtail Member

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    Dec 21, 2013
    Calgary
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    Higher than 2000? Not a civic...lol. Mine does the 1500 scream too (12 maxforce 13) but only when warming, it may be the aggressive egr in combination with the dpf. It only idles itself up to 1000 or maybe 1100 when warm, after 3 min like Arkevius mentioned. My truck will not let me set idle manually and that can be annoying, but the old wreck seems to take care of itself.
     
    Ysofast, Dec 25, 2013
    Ysofast, Dec 25, 2013
    #7
  10. Mar 7, 2021 #9
    TruckdrivingQ&A

    TruckdrivingQ&A Bobtail Member

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    Jan 23, 2020
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    2016 international prostar wont idle pass 1200 rpm any suggestions.
     
    TruckdrivingQ&A, Mar 7, 2021
    TruckdrivingQ&A, Mar 7, 2021
    #9
  11. Mar 7, 2021 #9
    ChuckMartel

    ChuckMartel Light Load Member

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    Jan 22, 2021
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    You need the max engine speed changed in your AESC parameters.
     
    ChuckMartel, Mar 7, 2021
    ChuckMartel, Mar 7, 2021
    #9
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