C15 accert coolant diverter valve problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by E model Cat man, Jul 5, 2016.

  1. Oscar the KW

    Oscar the KW .......

    10,894
    21,381
    May 19, 2011
    0
    Have you checked the air to air and hump hoses, also check the bellows between turbos and cooler, if they crack (which they are known for) fuel mileage will suffer.
     
  2. Oscar the KW

    Oscar the KW .......

    10,894
    21,381
    May 19, 2011
    0
    You're also winding it up to high before shifting, it'll do nothing but eat fuel over 1600.
     
  3. tony97905

    tony97905 Road Train Member

    1,015
    12,212
    Feb 28, 2015
    Land of Ahhhhhs
    0
    If it's making 55psi of boost and suffering from poor fuel mileage verify the exhaust isn't plugged. Also you need to monitor readings on CAT ET to make sure readings are within spec. In order to achieve boost you need fuel so it makes sense both of these symptoms happened simultaneously.
     
  4. TeeJayW900

    TeeJayW900 Bobtail Member

    1
    0
    Dec 29, 2017
    0
    What wound up being your problem? Did u ever figure it out ? My 2005 c15 Avery is a acting the same way
     
  5. E model Cat man

    E model Cat man Light Load Member

    61
    51
    Jun 10, 2014
    Northern Maine
    0
    It was a combonation of a high fuel temps around 185-190° from low fuel capacity at only 125gals full after wet system/split tank install, a really ####ty tec that had the overhead all over the place and had deleted the injection calibration codes from the ecm, etc...had overhead and ecm straitened out and added a fan cooled fuel cooler in the return line. Dropped fuel temps 50°+- and helped big time.
     
    Oxbow and SAR Thank this.
  • Draft saved Draft deleted