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Detroit DD15 Rough Idle with no fixes yet.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by SLCTrucker, Jul 18, 2010.

Page 1 of 2
  1. Jul 18, 2010 #1
    SLCTrucker

    SLCTrucker Medium Load Member

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    Jan 15, 2009
    Salt Lake City UT
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    So my Cascadia with a DD15 now has 440,00 miles on it.

    Still has the rough idle thing going on. Detroit cant seem to find a fix for it.

    Wondering if anyone else has same problems with the DD15 of has found a way to fix this issue.
    Also notice a slight surge/hesitation when getting on the power sometimes, not sure if this is linked to idle problems. They don't know
    Also still rough idles if I kick rpm's up to 900...

    On a brighter note fuel mileage is still over 6.8mpg running close to 80,000 all the time.

    Apart from the rough idle I am still real happy with the performance of this truck.
     
    SLCTrucker, Jul 18, 2010
    SLCTrucker, Jul 18, 2010
    #1
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  3. Jul 18, 2010 #2
    heavyhaulerss

    heavyhaulerss Road Train Member

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    AL/TN BORDER
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    heavyhaulerss, Jul 18, 2010
    heavyhaulerss, Jul 18, 2010
    #2
  4. Jul 18, 2010 #3
    SLCTrucker

    SLCTrucker Medium Load Member

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    Jan 15, 2009
    Salt Lake City UT
    0
    SLCTrucker, Jul 18, 2010
    SLCTrucker, Jul 18, 2010
    #3
  5. Jul 18, 2010 #4
    Cat nip

    Cat nip Light Load Member

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    Jan 17, 2010
    Magnolia, TX
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    I've heard that it is almost always the ecm. You can get a shop to put on a test ecm to see if it fixes the problem
     
    Cat nip, Jul 18, 2010
    Cat nip, Jul 18, 2010
    #4
  7. Jul 19, 2010 #5
    Bush chook

    Bush chook Light Load Member

    144
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    Apr 27, 2009
    Geelong
    0
    One jake solenoid playing up , valve clearances are the most common fault with dd15 idle characteristics but I,m sure the shop would have checked that- mcm calibrations for idle speed control values tells you whether your injectors are still within the values controlled by the mcm - the list goes on for the proceedures to check for your complaint - Have they given you a list of tests and checks that they tried ?
     
    Bush chook, Jul 19, 2010
    Bush chook, Jul 19, 2010
    #5
  8. Jul 19, 2010 #6
    SLCTrucker

    SLCTrucker Medium Load Member

    404
    199
    Jan 15, 2009
    Salt Lake City UT
    0
    No they havent given a list, but I see most DD15s are having this problem.
    They just dont know what is is...
     
    SLCTrucker, Jul 19, 2010
    SLCTrucker, Jul 19, 2010
    #6
  9. Aug 12, 2010 #7
    SLCTrucker

    SLCTrucker Medium Load Member

    404
    199
    Jan 15, 2009
    Salt Lake City UT
    0
    So I got the rough idle fixed...
    Turns out Detroit now have a fix for it.
    Took Detroit mechanic a while to install, but under warranty so all is good..
     
    SLCTrucker, Aug 12, 2010
    SLCTrucker, Aug 12, 2010
    #7
  10. Aug 12, 2010 #8
    rollinsmoke

    rollinsmoke Light Load Member

    62
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    Dec 23, 2008
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    What was it?
     
    rollinsmoke, Aug 12, 2010
    rollinsmoke, Aug 12, 2010
    #8
  11. Aug 12, 2010 #9
    Rnz520

    Rnz520 Bobtail Member

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    May 4, 2010
    Fredericksburg, VA, USA
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    i am curious as well, please share
     
    Rnz520, Aug 12, 2010
    Rnz520, Aug 12, 2010
    #9
  12. Aug 16, 2010 #10
    SLCTrucker

    SLCTrucker Medium Load Member

    404
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    Jan 15, 2009
    Salt Lake City UT
    0
    Ok asked the Detroit Guy what is was.. there is a control valve on the engine somewhere, that is what was replaced.
     
    SLCTrucker, Aug 16, 2010
    SLCTrucker, Aug 16, 2010
    #10
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