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!
Cummins ISX 485ST low oil pressure
Discussion in 'Kenworth Forum' started by Nefi, Jan 16, 2016.
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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.
Nefi Thanks this. -
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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?blairandgretchen and Nefi Thank this. -
shanman Thanks this.
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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"
Nefi Thanks this. -
I've seen the oil filter cause that problem more than once.
Nefi Thanks this. -
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.
Nefi Thanks this. -
Any updates?
I'm dying to know if it was the oil filter.
I've also seen that happen. -
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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