2019 Western star 5700, Hot exhaust light flashes at idle

Discussion in 'Western Star Forum' started by loose_leafs, May 24, 2021.

  1. loose_leafs

    loose_leafs Road Train Member

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    2019 Western star, DD13, the hot exhaust light is flashing slow at idle, about once every 8 to 10 seconds. This is the HEST light, NOT the DPF light.

    Seems like it surges or runs a little rough at times unless I set it to 900 RPM, the highest it will go.
     
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  3. jason6541

    jason6541 Road Train Member

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    Betting you idle a lot. Set idle to 900 anytime your doing extended idle.
    Probably stopped truck during a regen that was happening going down the road.
    If it keeps it up probably needs to go to dealer for diagnosis and May have a sensor or 2 not reading correctly. Haven’t had mine ever do that in over 800k miles.
    Neither one of my western stars. But they only idle 3 min to warm up and 3 to cool off that’s it
     
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  4. jason6541

    jason6541 Road Train Member

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    If surging at idle might be the fuel quantity valve back by fuel pump.. will cause it to surge. Anytime you do extended idle you need to run up to 900 rpm to keep the cyl temps snd pressure up. Still going to plug the face of dpf but high idle will help.
     
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