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Low Idle


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2007 mack granite cv713 tri axle dump with an Allison. 
Truck started to idle low couple months back.  Idles at 500 rpm. 
Since then changed 6 injectors.  
throws a 8-3 blink code occasionally. 
changed that EUP, however still idles at 500 rpm.  ABS light has been on for a while 

 

truck runs fine.   Just cannot figure out that low idle. Any help would be appreciated

 

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I had a 92 CH Mack that did that if I remember correctly they told me that somebody was probably poking the cruise control switch mutipal times quickly and caused a default code so I took it to mack and had it reset never caused problems after that

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I cant think of why the idle speed would change on its own, any recent programming been done?  Idle speed is easy to reset with Mack software. 880 Joe may be on to something here...  I'd like to know, jojo

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16 hours ago, 880joe said:

I had a 92 CH Mack that did that if I remember correctly they told me that somebody was probably poking the cruise control switch mutipal times quickly and caused a default code so I took it to mack and had it reset never caused problems after that

Yup seen this happen many times with Allison equiped units just a hicup in the program settings!  take it to a mack dealer have the dealer program the idle back to 650 and turn off the parameter to set the idle with  switches! this parameter requires you to hit the clutch switch to set the idle ! you have no clutch pedal so your unable to finish the set sequence!

Edited by fjh
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