oil pressure hi

Discussion in 'Peterbilt Forum' started by chickenlittle379, Jan 8, 2012.

  1. chickenlittle379

    chickenlittle379 Bobtail Member

    4
    0
    Jan 8, 2012
    Gunter, Texas
    0
    My oil pressure is 90@700rpm and 100@1600rpm and my manifold pressure is very low any ideas whats going
     
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  3. Duramaxxed

    Duramaxxed Light Load Member

    155
    60
    Jan 2, 2012
    Bourbonnais, IL
    0
    What kind of engine? Could be a barometric pressure sensor sending your gauges all whacked out.
     
  4. chickenlittle379

    chickenlittle379 Bobtail Member

    4
    0
    Jan 8, 2012
    Gunter, Texas
    0
  5. Duramaxxed

    Duramaxxed Light Load Member

    155
    60
    Jan 2, 2012
    Bourbonnais, IL
    0
    Herm, if its an E you most likely have a mechanical oil pressure gauge. Best thing to do would be take it to someone w/ a scanner / Cat ET. Toss a manual gauge on it next to the oil pressure sensor and compare readings from the ECM to the manual gauge. This will verify if you really do have an oil pressure problem, not a failed dash gauge. Could be a few things wrong causing you to make too much oil pressure, like sticking oil pump bypass valve. As far as the low boost, did both of these start happening @ the same time?
     
    Last edited: Jan 9, 2012
  6. chickenlittle379

    chickenlittle379 Bobtail Member

    4
    0
    Jan 8, 2012
    Gunter, Texas
    0
    Well done had it tested and and had the same results on the manual and dash gauge and yes both started about the same time took it to a shop and they said it was the oil pump after I put the oil New oil pump on I still have the same problems
     
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