2010 5.3 low oil pressure-help please
Registered User
Joined: Mar 2012
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New Have been reading this thread due to similar issues of no pressure and would like insight on the filter below the oil pressure sensor. Once pulling the sensor, how do you see/remove the filter?
Also, and equally as important, what is a DoD motor? Thanks for the help!
Also, and equally as important, what is a DoD motor? Thanks for the help!
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Joined: May 2017
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i have a 03 silverado doing the same thing. tried a o ring and no change. disassembled pump and everything looks fine. its a LQ4 6.0 non DoD does have an oil cooler.. oil pressure fluctuates cold or hot. 30 @ 2k. and at idle 25-10 then goes 10-0 and back. and there is no engine noise.
only thing i can think of is the oil barbell plug at the back of the oil galley behind the rear cover.
is this the oil restrictor?
only thing i can think of is the oil barbell plug at the back of the oil galley behind the rear cover.
is this the oil restrictor?
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Joined: May 2017
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Here is the deal 5.3 120,000 miles. Lifters come apart, replaced cam, lifters and oil pump. Truck has never had good oil pressure before this. Was within GM spec. So put another oil pump and new o-ring just to see what would happen. Nothing changed. Checked the pressure @ the filter and had about 30psi cold, engine warm went down to about 15ish. This is with a mechanical gauge. Then checked oil pressure at the sending unit with a mechanical gauge and found oil pressure @ 20psi cold but when it idles for 15 to 20 minutes it will drop to about 0-6psi. The mechanical gauge will show close to 0 sometimes. U can drive it and it will hold around 20psi but if it idles it close to 0. When checking pressure @ the filter it would never drop below 15psi. Why is there a drop between the filter and the sending unit?? Removed the oil pan and found nothing blocking the pickup tube.The truck has some oil pressure but not very much. Could cam bearings cause this?? (Yes, it is full of oil.)
Would help to know year of engine, size and what is done to it?
Main causes for low oil pressure is oil pump pickup tube o-ring failing, oil pump pressure relief failing, and worst case scenario is bearings.
In DOD engines, the oil pan releif can fail and constantly shoot oil at piston number 8. AFM/DOD lifters can fail, AFM/DOD solenoids can leak, Screen under Oil Pressure Sendor gets clogged.
Need more info to help determine possible problem. Have you checked with a proper mechanical gauge? Any ticking/tapping/knocking noises?
Main causes for low oil pressure is oil pump pickup tube o-ring failing, oil pump pressure relief failing, and worst case scenario is bearings.
In DOD engines, the oil pan releif can fail and constantly shoot oil at piston number 8. AFM/DOD lifters can fail, AFM/DOD solenoids can leak, Screen under Oil Pressure Sendor gets clogged.
Need more info to help determine possible problem. Have you checked with a proper mechanical gauge? Any ticking/tapping/knocking noises?
Registered User
Joined: Jul 2022
Posts: 5
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I bet I know what your problem is. I had the same thing happen to me. There is a screen under the intake valley cover, keeps debris out of the dod system. Clogs up and you get no oil pressure to your sending unit. Had mine replaced, they charged me $700 for the job. Should've done it myself. I hope this helps you out.
On The Tree
Joined: Jul 2020
Posts: 119
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I THINK this is along the same line of question.. I have a recently rebuilt (engine builder) 4.8 gen IV (2013) stock rebuild, I am getting around 9psi at idle, gets better w/ rpm. I know this is not right, looking for issues,suggestions or help to make pressure right? I did do the "trick" of jacking the rear of the truck up (get oil to front) and adding a quart and then turn on and see if pressure is better. it only raised the pressure a lbs or so. any suggestions? I will check with mech gauge in a day or so to verify my Dakota Digital Dash is reading correctly.
thanks!!
thanks!!
I THINK this is along the same line of question.. I have a recently rebuilt (engine builder) 4.8 gen IV (2013) stock rebuild, I am getting around 9psi at idle, gets better w/ rpm. I know this is not right, looking for issues,suggestions or help to make pressure right? I did do the "trick" of jacking the rear of the truck up (get oil to front) and adding a quart and then turn on and see if pressure is better. it only raised the pressure a lbs or so. any suggestions? I will check with mech gauge in a day or so to verify my Dakota Digital Dash is reading correctly.
thanks!!
thanks!!
