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ISX 565 Low Boost Pressure and High Exhaust Temps when cold

Discussion in 'Trucks [ Eighteen Wheelers ]' started by nightmayer86, Apr 2, 2014.

  1. Apr 2, 2014 #1
    nightmayer86

    nightmayer86 Bobtail Member

    4
    0
    May 31, 2013
    South Dakota
    0
    I have a 2007 KW T600 with an ISX 565 pre emission. The problem I am having is that when it is cold "mostly below 35 degrees" my exhaust temp will shoot up between 900 to 1000 degrees on flat ground with only 10 lbs of boost. When I get to a hill the max it will boost is only 25 and the exhaust temp remains high. When it does this I have no power and my fuel mileage suffers greatly. When it is warm out it runs great. I have no fault codes at all either. I have replaced the boost pressure sensor, exhaust pressure sensor, and the intake temp sensor and its still acting up. I've talked to Cummins and they seem clueless at what to do next. I was just curious if anybody else has had this issue before because I am tired at throwing sensors at it.
     
    nightmayer86, Apr 2, 2014
    nightmayer86, Apr 2, 2014
    #1
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  3. Apr 2, 2014 #2
    homerjer

    homerjer Bobtail Member

    10
    1
    Nov 11, 2012
    Imlay City, Michigan
    0
    Egr valve sticking?
     
    homerjer, Apr 2, 2014
    homerjer, Apr 2, 2014
    #2
  4. Apr 3, 2014 #3
    Edgar2191

    Edgar2191 Light Load Member

    178
    33
    Apr 9, 2013
    0
    When you say pre emmisions you mean no dpf right? Egr valves are for emmisions have u done basic chanfe air filter. Check for leaks to turbo what about turbo actuator?
     
    Edgar2191, Apr 3, 2014
    Edgar2191, Apr 3, 2014
    #3
  5. Apr 3, 2014 #4
    nightmayer86

    nightmayer86 Bobtail Member

    4
    0
    May 31, 2013
    South Dakota
    0
    Ya, there is not a DPF. Its an 06' model year engine. Just a variable vain turbo and a EGR valve. I have thought about the turbo actuator too, but would ambient air temp have affect that at all? Like I said if its warm out the truck runs great, when it gets cold is when it acts up. It does not smoke and there is no codes for it either so I am not sure if its the EGR valve or not. I am going to check all the the tubing going to the air to air. Maybe I have a cold weather leak. Thanks for your input!
     
    nightmayer86, Apr 3, 2014
    nightmayer86, Apr 3, 2014
    #4
  7. Apr 3, 2014 #5
    poppapump1332

    poppapump1332 Road Train Member

    2,987
    2,465
    Jan 2, 2010
    birdsboro,pa
    0
    Egr valve is clogged which is why your seeing low boost i have a isx same thing happened on mine and check engine light didnt come on
     
    poppapump1332, Apr 3, 2014
    poppapump1332, Apr 3, 2014
    #5
  8. Apr 3, 2014 #6
    peterblt

    peterblt Bobtail Member

    19
    3
    Sep 24, 2011
    0
    Egr valve clogged would cause high egt too? I have been fighting this same issue with a CM870 since back in october when it starting getting cold here in New England.No one can seem to figure it out after numerous sensors,turbo,CAC etc...
     
    peterblt, Apr 3, 2014
    peterblt, Apr 3, 2014
    #6
  9. Apr 3, 2014 #7
    NRG

    NRG Light Load Member

    166
    46
    May 21, 2010
    Lloydminster AB
    0
    Check for boost leaks. High EGTs could be also the result of that. I would ask Cummins to perform a pressure test. Could be cracked air-to-air or any of the clamps or hoses. To make sure it's not an EGR related issue, do an EGR disconnect, it would only do you good. ;)
     
    NRG, Apr 3, 2014
    NRG, Apr 3, 2014
    #7
  10. Jul 8, 2014 #8
    magnum2

    magnum2 Light Load Member

    111
    11
    Apr 25, 2014
    0
    educate me on going bigger with the exhaust, on the single exhauster system. why, why not? I'm currently running 5 inch pipe on the six with vgt turbo. Should I stay with 5 inch or go bigger, to 6 or 7 inch?

    Thank you.
     
    magnum2, Jul 8, 2014
    magnum2, Jul 8, 2014
    #8
  11. Jan 6, 2019 #9
    Csteele098

    Csteele098 Bobtail Member

    4
    0
    Dec 21, 2018
    0
     
    Csteele098, Jan 6, 2019
    Csteele098, Jan 6, 2019
    #9
  12. Jan 6, 2019 #10
    Csteele098

    Csteele098 Bobtail Member

    4
    0
    Dec 21, 2018
    0
    I'm having the same issue with a 2350 500hp isx just wondering if you figured it out so far new injectors turbo turbo actuator injector wiring harness p sensor imap sensor adjusted injector timing cummins bulletin new knox sensors new air to air thanks for any help you can give
     
    Csteele098, Jan 6, 2019
    Csteele098, Jan 6, 2019
    #10
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