Cat 3406B peec engine won’t idle down while shifting

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by jsetzer90, Sep 18, 2020.

  1. jsetzer90

    jsetzer90 Bobtail Member

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    Sep 18, 2020
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    Kind of stumped on what I have going on. while either upshifting or down shifting the engine will just hold rpm for awhile after you take your foot off the pedal which makes it very difficult to drive even if you try to double clutch. It will do the same if you just rev it while parked sometimes it takes 10+seconds to come down
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    Check for air in the fuel to the injection pump.
     
    jsetzer90 Thanks this.
  4. jsetzer90

    jsetzer90 Bobtail Member

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    Sep 18, 2020
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    I’ll check that when I get a chance. I don’t know what exactly has been done to it prior to me owning it but everything seems to be in good working order other than this issue. It did at one point hang right around 1500 for close to 30sec
     
  5. wore out

    wore out Numbered Classic

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    I would look closely at the throttle position sensor and the rack sensor or BTM I believe they called it
     
    pushbroom Thanks this.
  6. ERICD012

    ERICD012 Bobtail Member

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    Oct 18, 2020
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    Dirt on the fuel pedal
     
  7. Michael 247

    Michael 247 Light Load Member

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    My Big Cam Cummins done the same thing...I changed the Fuel Filter and it fixed it ..
     
  8. ultra truck

    ultra truck Bobtail Member

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    Possible lost a governor spring if it is a 3406B
     
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