Cummins ISX 485ST low oil pressure

Discussion in 'Kenworth Forum' started by Nefi, Jan 16, 2016.

  1. Nefi

    Nefi Bobtail Member

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    Jan 16, 2016
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    So I just bought a kenworth with a ISX 485ST Cummins and I'm getting low oil pressure at a constant 20psi city streets and highway speeds. And whenever it it goes a little bit below the 20psi mark the engine goes crazy, the check engine light turns on and then the stop engine light turns on and after a half of min or so the truck turns off while running. So would it be the oil pump or the oil regulator for the loss of pressure? Or even the filters? I don't know when it was last serviced since I just got it about two days ago. Any help please?!?! Thank you!
     
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  3. shanman

    shanman Light Load Member

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    Change your filters and see if that helps. I would change the oil since you don't know when it was last done.
     
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  4. Nefi

    Nefi Bobtail Member

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    I think I will do that as soon as possible, I've been reading similar threads like mine and many have suggested to replace filters and oil. If that fails I guess I'll be taking back to kenworth, I'm glad I grabbed that warranty before taking off the lot or else I would be worried as heck.
     
  5. Cottonmouth85

    Cottonmouth85 Bad Influence

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    If no change after a servicing I would change the sensor(s).

    Those little buggers are pretty cheap and will leave you on the side of the road when they fail.

    Hows your Temps look?
     
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  6. Nefi

    Nefi Bobtail Member

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    Jan 16, 2016
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    True that!.......temps are normal on the oil and cooler. I had a problem similar to this on my other truck once, it's a cat 3406e on a old Pete. The oil pressure was at 40 and that had me worried because it would always run 50psi or higher, then I got it serviced at came back to normal. Then I decided to try out the Cummins and now I get this, I was like nope, 20psi on the oil ot normal at all. I called my sales man at kenworth and told him about the issue and said he was going to ask the shop tech at kenworth, we'll see what he says! Lol
     
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  7. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    romulus,mi
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    If filter and oil change does not help. If you have warranty, take in ASAP. Tell KW to follow proper procedure from Cummins regarding properly timing engine using static timing procedure. It took many years for Cummins to admit and fix this problem. If repaired correctly you will notice better m.p.g./ power / oil pressure and no more "air compressor knock"
     
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  8. DrFlush

    DrFlush Road Train Member

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    I've seen the oil filter cause that problem more than once.
     
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  9. shanman

    shanman Light Load Member

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    Silverton, OR
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    I always keep spare filters (oil/fuel)in my truck although I have never had low oil pressure on my isx. My uncle who also has an isx has had that problem. He changes the filter and all is good. That's why I have a spare just incase.
     
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  10. texasdante

    texasdante Bobtail Member

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    Jan 25, 2016
    El Paso, Texas
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    Any updates?
    I'm dying to know if it was the oil filter.
    I've also seen that happen.
     
  11. Nefi

    Nefi Bobtail Member

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    Lol so yes, I got it serviced and after that until now the oil pressure has gone back to normal. It's running at 40 psi now, which I think it's normal. That's the news for now!
     
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