Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

03 6NZ CAT Vibration

Discussion in 'Trucks [ Eighteen Wheelers ]' started by largecar1, Dec 29, 2011.

Page 1 of 2
  1. Dec 29, 2011 #1
    largecar1

    largecar1 Bobtail Member

    3
    0
    Dec 29, 2011
    0
    I have an 03 6NZ that has a bad vibration in it. Put the Pittsburgh power dampener and balancer on the front of it and hasn't changed anything. ECM throws random codes through the check engine light but they are never stored in the ECM when I got to a CAT dealer to get it checked. Cyclinder cut out tests say injectors are working like normal. I was wondering if possible ECM malfunctioning and throwing timing off to cause shake?
     
    largecar1, Dec 29, 2011
    largecar1, Dec 29, 2011
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Dec 29, 2011 #2
    Dice1

    Dice1 Road Train Member

    1,315
    609
    Jul 1, 2011
    Bessemer City, NC
    0
    What about motor mounts?

    Fuel lines bad?
     
    Dice1, Dec 29, 2011
    Dice1, Dec 29, 2011
    #2
  4. Dec 29, 2011 #3
    paul 1052

    paul 1052 Heavy Load Member

    899
    346
    Oct 9, 2010
    Sand Springs, Ok.
    0
    I've had several bad injectors pass the cutout test, we had to play around cutting them out individually to see which one made the least difference in how the engine felt.

    I forget how to do it but you can take a "snapshot" of what's going on with the engine/ecm when it's acting up by using the cruise control switches. Cat can look at that later to see what was going on.
     
    paul 1052, Dec 29, 2011
    paul 1052, Dec 29, 2011
    #3
  5. Dec 29, 2011 #4
    rollin coal

    rollin coal Road Train Member

    13,270
    26,733
    Mar 29, 2008
    TN
    0
    They can hook the laptop up, hop in the passenger seat and you can go for a ride down the highway to see if it will happen again under normal driving conditions..
     
    rollin coal, Dec 29, 2011
    rollin coal, Dec 29, 2011
    #4
  7. Dec 30, 2011 #5
    power freak

    power freak Light Load Member

    220
    60
    Apr 23, 2009
    0
    If the check engine light comes on but does not store a code I would guess code 22-11 which is primary to secondary engine speed sensors out of calibration. If you leave the truck running after the light comes on and get it Plugged in they will be able to see the code. If it is 22-11 it can be caused by the engine vibration adjustable idler backlash set wrong or the cam gear installed a tooth off. My next question is was this engine apart recently? There is also the possibility of a broken crank.
     
    power freak, Dec 30, 2011
    power freak, Dec 30, 2011
    #5
    bigstank Thanks this.
  8. Dec 31, 2011 #6
    largecar1

    largecar1 Bobtail Member

    3
    0
    Dec 29, 2011
    0
    Motor mounts are good, Put new fuel lines on it 6 months ago, check for air in the fuel system- none. I took a couple snapshots too and when they were looked up at CAT they were dated for 1996. A little weird cause the motor is an 03. Codes are off the wal, like idle shutdown override, sensor calibration. Just weird codes. The motor had the shake when i got it 4 yrs ago and had it overhauled 200,000 miles ago and its still there. Sometimes its smooth and other times it feels like the wheels are gonna fly off. Worse shake the harder you step on the accelerator pedal.
     
    largecar1, Dec 31, 2011
    largecar1, Dec 31, 2011
    #6
  9. Dec 31, 2011 #7
    DDS

    DDS Medium Load Member

    519
    177
    May 20, 2008
    Toronto
    0
    Anyone backed the clutch off yet?
     
    DDS, Dec 31, 2011
    DDS, Dec 31, 2011
    #7
  10. Dec 31, 2011 #8
    Bent Wrench

    Bent Wrench Medium Load Member

    588
    205
    Aug 11, 2009
    Cornholio, OR
    0
    Try a different PCM?
     
    Bent Wrench, Dec 31, 2011
    Bent Wrench, Dec 31, 2011
    #8
  11. Dec 31, 2011 #9
    Mr. Haney

    Mr. Haney Road Train Member

    2,693
    2,040
    Dec 17, 2008
    0
    DDS could very well have hit the nail on the head.

    Spicer had some bad drive discs out there and this could very well be the problem
     
    Mr. Haney, Dec 31, 2011
    Mr. Haney, Dec 31, 2011
    #9
  12. Dec 31, 2011 #10
    ENR

    ENR Light Load Member

    254
    50
    Oct 8, 2009
    Ontario
    0
    I get an on and off vibration out of my MSX during the winter months. I've had it through my inframe so injectors are out. It will change when I drain off my primary ( water separator ) so I think it has to be fuel related.

    The confusing part is that it will coincide with my speedometer fluctuating up and down by a few mph.

    I plan on trying an Air-dog or FASS.

    If you figure it out please update us..
     
    ENR, Dec 31, 2011
    ENR, Dec 31, 2011
    #10
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

    • Page 1 of 2