Low oil pressure when warm and stopped
Low oil pressure when warm and stopped
Hey guys was need to see if I can get some feedback or advice I bought a 2000 ram 1500 4x4 with a 5.9 magnum this truck has alittle more than 150k miles on it I didn't notice when I got it but after maybe a week of driving it, it started showing a low oil pressure light and the gauge drops down to zero when at idle or stopped in traffic. Its fine on cold start and show about 50psi until its warm then drops to zero when low rpm. I changed the oil and put a new filter no changes im just hoping its not the bearings,engine runs smooth no knocking or pinging thanks in advance
Grand Champion
Joined: May 2019
Posts: 5,159
Likes: 724
From: S.W. Indiana
Hey guys was need to see if I can get some feedback or advice I bought a 2000 ram 1500 4x4 with a 5.9 magnum this truck has alittle more than 150k miles on it I didn't notice when I got it but after maybe a week of driving it, it started showing a low oil pressure light and the gauge drops down to zero when at idle or stopped in traffic. Its fine on cold start and show about 50psi until its warm then drops to zero when low rpm. I changed the oil and put a new filter no changes im just hoping its not the bearings,engine runs smooth no knocking or pinging thanks in advance
In the short term, you can go with a heavier weight oil. At that mileage, your timing chain may need replacement. If you do that, you might also put a high VOLUME oil pump in the engine. This will compensate for worn bearings. What oil are you using in it now?
Administrator
Joined: Apr 2010
Posts: 87,482
Likes: 4,223
From: Clayton MI
The oil pressure sending units are notorious for this type of failure. If pressure drops to zero at stops on a warm engine, but, jumps right up to where it should be if you give it even a little bit of gas, that's a bad sending unit.
Grand Champion
Joined: May 2019
Posts: 5,159
Likes: 724
From: S.W. Indiana
'Doh!
i forgot about failing sending units. Hook a mechanical guage to a tee and read the pressure where the sending unit is. The Tee will let you keep the guage in line so the computer doesn't shut the engine down. If the mechanical reads good pressure, just replace the sending unit.
Bad news!
hey guys thanks for the replies unfortunately the engine locked down this weekend and had to get it trailered back home. Not to worried about it its not my daily so ill start saving up for a new engine might go to my local wrecking yard and find a decent one till I'm ready to do a new full bulid. Also any one have any good places to get a rebuilt 5.9 magnum?? thanks
Last edited by Dave3316; Apr 13, 2021 at 09:49 PM.
Administrator
Joined: Apr 2010
Posts: 87,482
Likes: 4,223
From: Clayton MI
Your local parts store likely sells them. Jasper makes decent stuff, but, they have some pretty strict requirements if you want the warranty that goes with it. There are numerous others out there.
