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Old 04-26-2013, 08:22 PM
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Question Oil pressure drop when come to a stop

I just bought a 2003 F250 6.0. After you drive it for a while and everything reaches normal operating temps. I stoped at a red light and notice my check gauges light came on. I looked and I had no oil pressure. I put it in nutrual and gave it a little gas and it poped right back up to normal range. Concearned watched it and evertything was normal. Drove around for a while with no real issues. Stopped at another light and it did the same thing. Pressed on the gas peddle again and it poped back to norma(left it in gear this time) and stayed there. No noticable changes in iddle or noises when it did this. Any thoughts on this?
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Old 04-29-2013, 04:43 AM
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If you lose oil pressure from the low pressure pump, your engine should quit running because you lose the oil supply to your hpop which should cause the injectors to quit working. That being said, I would first check/replace the oil pressure sensor to make sure that it's working properly. If it's working correctly and you are losing oil pressure, I'd drain the oil and inspect it well to see if you have any metal shavings or lifter bearings in it. If you have metal, something probabaly went through your oil pump and scored the front cover just enough to lose pressure when at idle. If that's the case, quit driving it while your core engine is still good.
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Old 04-29-2013, 09:08 AM
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I'll check that when I get back. I was thinking the same thing about the sensors. It wil idle all day with oil pressure just when I stop it drop instantly to zero then a little gas it goes back up and stays.
Thanks for the advice.
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Old 04-29-2013, 01:37 PM
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There are also lots of instances where it was just a wiring issue. Chaffing wires and such. A lot of guys narrowed down, by giving the dash a good thump to see if it would correct itself. The low pressure oil sensor is more of a switch, make and break, only takes 7 psi to make. This is why a lot of guys, including myself, install a real oil pressure gauge
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Old 05-03-2013, 09:20 AM
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Thanks I'll give it a try when I get back home from Iraq.
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Old 05-03-2013, 10:02 AM
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Quote:
Originally Posted by 1st DSL Truck View Post
Thanks I'll give it a try when I get back home from Iraq.
Okay, here we go.

If the oil pressure sender is good, the wiring to the sender is good then the most likely answer is going to be the dreaded "ball bearing" in the side of the high pressure oil pump has fallen out.
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Old 05-03-2013, 10:03 AM
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Are you there defending our country? Thank you for your service if you are
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Old 05-11-2013, 03:35 AM
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Old 05-11-2013, 04:40 AM
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From one to another thanks for your time and service!!! USA 82nd OUT!
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Old 05-11-2013, 05:43 AM
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oil sending unit is bad , see it all the time
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