Oil light came on

Discussion in 'KJ General Discussion' started by Jaybird91, Oct 23, 2020.

  1. Jaybird91

    Jaybird91 Member

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    This morning i turned on my kj and didnt warm up as i usually do . When i took off after about 30sec . Warm up my oil light illuminated then turned off. I kept driving a little more then it flashed more time. What could it be? Thanks
     
  2. tommudd

    tommudd Moderator Staff Member Moderator

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    Have you checked the oil?
    If it is ok then more than likely it is the oil sending unit, they go bad and will cause them to come on
    Oil sending unit is above the oil filter, use MOPAR brand for best results
     
  3. LibertyTC

    LibertyTC Well-Known Member Staff Member Moderator

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    X2 ^ The oil pressure sending unit has a 3 wire connector & located above the oil filter.
    I called a dealer to confirm the current part number which is: 5149097AA & they are available.
    [​IMG]
     
  4. HoosierJeeper

    HoosierJeeper Gold Supporter/Admin Staff Member Administrator

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    Just replaced mine this week, easy job.
     
  5. jp7794

    jp7794 Full Access Member

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    Mine did the same thing. If it didn't blow up it is the sending unit.
     
  6. Jaybird91

    Jaybird91 Member

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    Thanks everyone for helping. My oil level is good . I will replace this sending unit first. I thought it might be the oil pump.
     
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  7. Jaybird91

    Jaybird91 Member

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    I was replacing my oil sender unit and the tabs broke off where the red tab goes . I plugged it back in and my light still comes on and off still. What should i do next? Thanks
     

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  8. tommudd

    tommudd Moderator Staff Member Moderator

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    Clean it up well and use a wire tie to keep it together
     
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  9. Jaybird91

    Jaybird91 Member

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    The red light is still flashing only when i come to a stop then goes away when i drive normally with out stopping. Can the electrical connector itself be bad? I feel like the light wants to stay off.
     
  10. kejobe

    kejobe Full Access Member

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    If the light is in at low rpm and off at higher rpm’s, it is possible the oil pump is starting to go and not provide the necessary flow/pressure at the lower rpm’s.

    First I would clean the connector and sensor at the electrical connection. Use a zip tie of something to keep the connection tight. See what happens. If the light stays off your good to go. If it still goes on and off, personally I’d start thinking of changing the oil pump.

    Before all this, I must ask. What brand oil filter and what brand/viscosity oil are you running???

    Reason I ask is I had the same issue when I didn’t have much $$ to spend and used STP oil and STP filter. Changed two weeks later to Mobil 1 5w-30 oil and Mopar filter. Light stayed off until the sensor went bad.
     
  11. Jaybird91

    Jaybird91 Member

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    I was thinking it might be a
    i was thinking it might be the pump because it started to get cold in the mornings here in SoCal . I noticed at first when i left early one morning and it started to flash but then it keep coming back on more and more as i leave in the mornings. I use amsoil and wix oil filter. How do i test/check the oil pump ? Can it be replaced? If the vanes are worn then it makes sense why there isn't enough oil pressure readings at start up.
     
  12. Jaybird91

    Jaybird91 Member

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    Ok so I unplugged the oil sender unit and the red light stood on. I plugged back in and same flashing issue periodically while driving . Could it be the connection to the harness? I have a strong start up and idle so it cant be the pump . Can i just bypass the connection some how ?
     
  13. JeepJeepster

    JeepJeepster Full Access Member

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    At this point putting a mechanical gauge on it and seeing what the actual oil pressure is would be a good move.

    Just curious, what weight oil do you use?
     
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  14. Jaybird91

    Jaybird91 Member

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    I will check oil pressure . I use amsoil. lasted changed was about 4,000 miles ago. Level seems fine i even topped it off just in case. Thanks
     

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  15. LibertyTC

    LibertyTC Well-Known Member Staff Member Moderator

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    Are you using 5w-30?
     
  16. Jaybird91

    Jaybird91 Member

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    Yes
     
  17. Jaybird91

    Jaybird91 Member

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    I got the pressure reading at 4psi at parking idle . upon start up it went from 15 psi to under 10psi. I revved it to about 3000rpm and i got some pressure at 25psi barely.
    How is that my engine is still running fine with this? Im going to do an oil flush and see what happens . Maybe its time for an early oil change at least before i do the oil pump .
     
    Last edited: Nov 3, 2020
  18. JeepJeepster

    JeepJeepster Full Access Member

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    At least its not zero, maybe that little bit of oil pressure has kept the bearings lubed.