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I've got a 6nz problem.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Robnozz, Apr 17, 2009.

Page 1 of 3
  1. Apr 17, 2009 #1
    Robnozz

    Robnozz Bobtail Member

    38
    0
    Oct 15, 2008
    Milwaukee,WI
    0
    I have a 2001 6nz cat with 670,000 miles on it, and for about 6 months I've had a vibration that I feel in the floor and "gas pedal". It's only under full torque. Replaced the clutch in Dec checked all the u-joints, yokes and all felt tight. But it is getting worse.

    Any ideas?
     
    Robnozz, Apr 17, 2009
    Robnozz, Apr 17, 2009
    #1
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  3. Apr 17, 2009 #2
    Biscuit75

    Biscuit75 Road Train Member

    1,035
    849
    Apr 4, 2009
    Central Ohio via the Suburbs of Detroit
    0
    I would say maybe have your fuel injectors tested?? Does it feel underpowered or anything?
     
    Biscuit75, Apr 17, 2009
    Biscuit75, Apr 17, 2009
    #2
  4. Apr 17, 2009 #3
    Robnozz

    Robnozz Bobtail Member

    38
    0
    Oct 15, 2008
    Milwaukee,WI
    0
    Replaced the cam and injectors at the beginning of 2008, doesn't seem underpowered.
     
    Robnozz, Apr 17, 2009
    Robnozz, Apr 17, 2009
    #3
  5. Apr 17, 2009 #4
    Biscuit75

    Biscuit75 Road Train Member

    1,035
    849
    Apr 4, 2009
    Central Ohio via the Suburbs of Detroit
    0
    Hmmm, injectors can be tricky. I put some in my c-15 when I had one and a few months later had to have 2 replaced. Could be something in the transmission...? Or Fuel filters? That would be an easy and cheap fix to try. That's why I no longer own trucks. Too much guessing. LOL
     
    Biscuit75, Apr 17, 2009
    Biscuit75, Apr 17, 2009
    #4
  7. Apr 17, 2009 #5
    Robnozz

    Robnozz Bobtail Member

    38
    0
    Oct 15, 2008
    Milwaukee,WI
    0
    Yeah I hear you. My feeling is it's in the motor, just doesn't feel like it's in the tranny. Thanks for the reply.
     
    Robnozz, Apr 17, 2009
    Robnozz, Apr 17, 2009
    #5
  8. Apr 17, 2009 #6
    Biscuit75

    Biscuit75 Road Train Member

    1,035
    849
    Apr 4, 2009
    Central Ohio via the Suburbs of Detroit
    0
    No prob. I will ask a mechanic friend of mine in the morning and post anything he may think of for ya to check. Good Luck!
     
    Biscuit75, Apr 17, 2009
    Biscuit75, Apr 17, 2009
    #6
  9. Apr 17, 2009 #7
    DDS

    DDS Medium Load Member

    519
    177
    May 20, 2008
    Toronto
    0
    Have you had your ride height checked or drive line angles?
     
    DDS, Apr 17, 2009
    DDS, Apr 17, 2009
    #7
  10. Apr 17, 2009 #8
    Robnozz

    Robnozz Bobtail Member

    38
    0
    Oct 15, 2008
    Milwaukee,WI
    0
    I just pulled an overheight load this week, and the trailer deck height was what it has been. I would think the drive line angle would be the same, if the height hasnt changed, right?

    Don't know if this helps diagnose it, but it has been smoking alot more at start-up, whether it be a cold start, or a warm one. The smoke is white to grey colored.
     
    Robnozz, Apr 17, 2009
    Robnozz, Apr 17, 2009
    #8
  11. Apr 18, 2009 #9
    CaterpillarWrench

    CaterpillarWrench Light Load Member

    188
    49
    Nov 11, 2008
    Wrenching feverishly
    0
    Do you know what your fuel pressure is? Does the engine idle rough at all?What about wide open under no load at operating temp?Was the stock cam put in?
     
    CaterpillarWrench, Apr 18, 2009
    CaterpillarWrench, Apr 18, 2009
    #9
  12. Apr 18, 2009 #10
    DDS

    DDS Medium Load Member

    519
    177
    May 20, 2008
    Toronto
    0
    Have you checked the magnets in the diffs? I have had two trucks this month that had the same type of vibration and it was a failed bearing in a diff.
     
    DDS, Apr 18, 2009
    DDS, Apr 18, 2009
    #10
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