Atmospheric pressure

Discussion in 'Ask An Owner Operator' started by Rob2isking, 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
     
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  3. scoobertdoo

    scoobertdoo Heavy Load Member

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    At sea level 14.4 it goes down the higher you are
     
  4. ProfessionalNoticer

    ProfessionalNoticer Road Train Member

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    Make sure nothing is grounding out anywhere. Could cause a derate.
     
  5. Rob2isking

    Rob2isking Light Load Member

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    If it was Derald, wouldn’t the ecm show something on cat et?
     
  6. Rob2isking

    Rob2isking Light Load Member

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    I mean derate*
     
  7. 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.
     
  8. Rob2isking

    Rob2isking Light Load Member

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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
     
  9. Rob2isking

    Rob2isking Light Load Member

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    I’m also in southern Oklahoma, so I’m not very high above sea level
     
  10. 062

    062 Road Train Member

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    What is the voltage at the plug?
     
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