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Oil Pressure Gauge Pegged

This is a discussion on Oil Pressure Gauge Pegged within the External Engine forums, part of the LSx Technical Help Section category; Replaced engine. Fires right up. Oil gauge is pegged. Replaced the sensor and checked the wiring the best I could. ...

  1. #1
    Blown, Stroked, & Sprayed

    Ed Blown Vert's Avatar
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    Oil Pressure Gauge Pegged

    Replaced engine. Fires right up.
    Oil gauge is pegged.

    Replaced the sensor and checked the wiring the best I could.

    What else could it be?

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    First thought is bad sensor.

    What is the reason why the original sensor was replaced??? Just in case?

  3. #3
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Try checking the part # they may have given you the wrong sensor. A full 12v would peg the guage and hate to say it but the guage could now be toast.. Sounds like over voltage and most guages do'nt like to be pegged for long they will fry or become damaged to the point where it will never be accurate again..
    Last edited by Smittro; 09-19-2009 at 01:37 AM.
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    Blown, Stroked, & Sprayed

    Ed Blown Vert's Avatar
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    Looks like the sensor wire is either pinched or broken somewhere in the harness that runs into the cab.

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    Veteran Hi-Po's Avatar
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    Wiring. How are you running the wires in the cab? Is this aftermarket? If the guages is moving at all (pegged) that would make one think its at least getting power. I would check the ground side of things. Although, I dont know if this is aftermarket wiring or not.

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    Its all stock wiring. Grounds look good.

    I was able to trace the sensor wire to inside the cab. If I ground it, the gauge will read zero. Which tells me the wiring is fucked.

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    Quote Originally Posted by Ed Blown Vert View Post
    Its all stock wiring. Grounds look good.

    I was able to trace the sensor wire to inside the cab. If I ground it, the gauge will read zero. Which tells me the wiring is fucked.
    Well, tracing that down will be a major PITA. You could try and follow that wiring and look for obvious problems. Running new wiring might be easiest. Whenever I had a electrical problem that was obvious wiring... I would make new wiring and run it.

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    Blown, Stroked, & Sprayed

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    I was running a new wire from the cab to the sensor plug, then the plug cam off. That is where the break was.

    Resoldered and I have oil pressure showing on my gauge.

  9. #9
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    Quote Originally Posted by Ed Blown Vert View Post
    I was running a new wire from the cab to the sensor plug, then the plug cam off. That is where the break was.

    Resoldered and I have oil pressure showing on my gauge.

    Where did you run your wires into the cabin at? I understand there is a place under the PCM, but am wondering if there is anything on the driver side that is reasonably accessible.

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    Veteran Hi-Po's Avatar
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    Quote Originally Posted by Ed Blown Vert View Post
    I was running a new wire from the cab to the sensor plug, then the plug cam off. That is where the break was.

    Resoldered and I have oil pressure showing on my gauge.
    Glad you found it easily.
    Quote Originally Posted by pajeff02 View Post
    Where did you run your wires into the cabin at? I understand there is a place under the PCM, but am wondering if there is anything on the driver side that is reasonably accessible.
    No, there is no hole on drivers side. Have to make your own.

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