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Atmospheric pressure

Discussion in 'Ask An Owner Operator' started by Rob2isking, Jan 28, 2022.

  1. Jan 28, 2022 #1
    Rob2isking

    Rob2isking Light Load Member

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    What’sa normal reading for atmospheric pressure? I have a 2007 Pete 379 with a c15 Acert MXS. CatEt reads 13. I put a new sensor in and it shows status flag -altitude adj- I’m getting low boost, no check engine light. Just trying to go through the steps of diagnosing
     
    Rob2isking, Jan 28, 2022
    Rob2isking, Jan 28, 2022
    #1
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  3. Jan 28, 2022 #2
    scoobertdoo

    scoobertdoo Road Train Member

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    At sea level 14.4 it goes down the higher you are
     
    scoobertdoo, Jan 28, 2022
    scoobertdoo, Jan 28, 2022
    #2
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  4. Jan 28, 2022 #3
    ProfessionalNoticer

    ProfessionalNoticer Road Train Member

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    Make sure nothing is grounding out anywhere. Could cause a derate.
     
    ProfessionalNoticer, Jan 28, 2022
    ProfessionalNoticer, Jan 28, 2022
    #3
    Keepforgettingmypassword Thanks this.
  6. Jan 28, 2022 #5
    Rob2isking

    Rob2isking Light Load Member

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    If it was Derald, wouldn’t the ecm show something on cat et?
     
    Rob2isking, Jan 28, 2022
    Rob2isking, Jan 28, 2022
    #5
    Keepforgettingmypassword Thanks this.
  7. Jan 28, 2022 #6
    Rob2isking

    Rob2isking Light Load Member

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    I mean derate*
     
    Rob2isking, Jan 28, 2022
    Rob2isking, Jan 28, 2022
    #6
  8. Jan 29, 2022 #6
    ProfessionalNoticer

    ProfessionalNoticer Road Train Member

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    I put a temp sensor on my CAT a few years ago and one of the wires was grounding out but I didn't know it until later while driving down the road. Initially it seemed fine than all of the sudden I lost power and didn't know why. About a half hour later I figured it out. Never got a CEL or anything. Not saying this is your issue but I would certainly investigate the wiring as well as the sensor itself. It's not that uncommon to get a "new" sensor that's faulty directly from the seller.
     
    ProfessionalNoticer, Jan 29, 2022
    ProfessionalNoticer, Jan 29, 2022
    #6
  9. Feb 4, 2022 #8
    Rob2isking

    Rob2isking Light Load Member

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    Apr 30, 2015
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    I still haven’t figured this out. My atmospheric reading is 13. I put a new sensor In but theirs still status flag that reads “altitude adj active”. My air filters aren’t even a year old and I’ve cleaned them out a few times since I’ve bought them. Replaced the stmospheric sensor. No CEL only status flag showing when I plug in Cat ET. Says that the altitude adj means the ecm cuts back on fuel. I can’t get over 34 lbs of boost now. C15 acert In a 2007 Pete 379
     
    Rob2isking, Feb 4, 2022
    Rob2isking, Feb 4, 2022
    #8
  10. Feb 4, 2022 #8
    Rob2isking

    Rob2isking Light Load Member

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    Apr 30, 2015
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    I’m also in southern Oklahoma, so I’m not very high above sea level
     
    Rob2isking, Feb 4, 2022
    Rob2isking, Feb 4, 2022
    #8
  11. Feb 4, 2022 #9
    062

    062 Road Train Member

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    What is the voltage at the plug?
     
    062, Feb 4, 2022
    062, Feb 4, 2022
    #9
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