ISX Cummins running crappy...I think ?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 75woody, Dec 12, 2006.

  1. HwyPilot

    HwyPilot Medium Load Member

    May 31, 2008
    Northern Georgia
    So far I've always been pleased with the power my 05 ISX puts down (and the jakes are AWESOME) - my main complaint has been trying to break the 6mpg barrier. IMO someone should start a class action lawsuit on the crappy EGR systems, and the lack of retrofitting for their disaster of a design. While mine was in the shop getting a new cooler and EGR valve, I had the overhead done and up-rated to 550HP (from 475). I haven't noticed much difference outside of other changes I had made (LBSC off, GDP off).

    $2000 would be more reasonable, but I still think it should be our option to have this junk removed from our trucks and thrown over the fence. Thanks to the ya-hoos in the state capitals, most states have idle penalties on anything pre-2007 - GREAT - so my 05 EGR equipment gets me nothing but less mpg and more expense. Not to mention the risk of blowing up a $20,000 engine because of a poorly designed EGR cooler that has been shown to fail more often than not. THANKS EPA!! I'll breathe so much better knowing it may cost me the food on my plate.
  2. gregor

    gregor Light Load Member

    May 13, 2011
    i'm driving a volvo 06 with isx475 , all i did is egr plug disconnected, little welding performance ,met illinois diesel doctor to get this thing to be full open ...that's it!!!! power great ,pulling great couldn't be better:biggrin_255:
  3. rbelinger

    rbelinger Bobtail Member

    Jun 12, 2011
    2006 International 9900I, ISX 475, 13 speed overdrive, 3:73 rears on small rubber
    Problem: Intermitent when engine at operating temp. low power, occasional EGR bark, high water temp (210 F), fan comes on at 190 F for 2 seconds, 200 F for 1 or 2 seconds and 210 F for almost 25 seconds. continuous black smoke while pulling under load in top 2 gears, fuel milage at high 4s to low 5 mpg

    When parked running A/C at operating temp, flashing warning lights(high water temp, low oil pressure etc), beeping consistant, ALL gauges pinning themselves to max limits including (voltage, oil pressure,water temp, tach and speedo)

    Replaced 2 EGR valves, exhaust temp sensor ,removed and cleaned exhaust pressure tubes along with the air intake horn, removed as many electrical plugs as I could get at , cleaned with electronic contact cleaner and applied dielectric grease.

    Conclution; Can't decide if I should throw more money into it having certified technicians guess at the problem or just yank it out and drop in a N-14 and use my ISX for a good boat anchor.

    What do you all think ?
  4. jlevans369

    jlevans369 Bobtail Member

    Apr 13, 2011
    pull the air actuator off of the turbo and see if the sector shaft moves freely up and down. if it feels like it has tension on it or is stuck you need a new turbo. common problem with black smoke under a pull. as far as the other weird things...if you have a test ecm available i would try that and see what happens.

  5. bdmose

    bdmose Light Load Member

    Aug 15, 2008
    anywhere but my home in VA
    I don't know who to blame, the mechanics at KW/Cummins or the ISX. My truck is in the shop getting its 5th turbo...........Obviously something else is wrong and the "code readers"/"mechanics" are just replacing 1 after another without finding the true problem. I have an 07 t2000, I believe this was the first year they put the Regen system on. Has anyone else had that many problems with ANY truck they have ever driven?
  6. Pappa Bear

    Pappa Bear Light Load Member

    Dec 20, 2010
    Springfield, OH
    Do you let the turbo cool down before shutting it off?
  7. chais

    chais Bobtail Member

    Nov 10, 2011
    This truck should pull with that motor and those gears.. The turbos in this motor stick and it sounds like that is what it doing to you! Ask cummins for policy on it ! They should help you out ! Good luck!
  8. Sako3006

    Sako3006 Bobtail Member

    Oct 3, 2011
    Well, I'm sorry to say this, but you have about the worst truck spec wise for having major issues. The early T2000's were nightmares with the new regen, and it's the same way with the ISX. I sold many of these trucks before the problems slowly started overwhelming Paccar dealers. Personally, after having this many turbos, etc. I would be getting a different truck. Try a new KW T660.
  9. aronbarbaron

    aronbarbaron Bobtail Member

    Nov 24, 2011
    Chicago, IL
    I have a Volvo 780 with cummins isx 450. I had all problems described above until I just turned the EGR off. Now is running better, it gets good fuel mileage 6.8-7.2 average.
  10. chais

    chais Bobtail Member

    Nov 10, 2011
    I have 9 of these trucks. That sounds like it might be the turbo. In these trucks the turbo will stick, so some times it will pull really good then nothing! Did they check the turbo actuator or the boots from the air to air.
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