Little to no oil pressure while at idle - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 12-26-2010, 07:33 AM Thread Starter
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Little to no oil pressure while at idle

I dont know if my sensor is getting bad or what. Truck starts fine runs fine and drives fine. Has 290,000 on the engine. When the truck idles it reads no oil pressure. i changed the oil and added lucas oil additive and it got better, but now it twitches between no pressure and normal reading. Anyone got any ideas.
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post #2 of 7 Old 12-26-2010, 07:36 AM
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hook up a mechanical gauge to the hpop reservoir somewhere.

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post #3 of 7 Old 12-26-2010, 06:01 PM
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The sending unit is on the hpop reservoir. It has a single wire going to it. Clean up that connection and give it a go. Also as mentioned, slap a mechanical gauge on the hpop reservoir so you can compare the actual to the dash.

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post #4 of 7 Old 12-26-2010, 06:55 PM
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that guage is only an idiot light, it doesnt show actual oil pressure, if its below a certain level, it goes to zero and if its above it, it goes to normal, the sender probably went bad, remember the injectors need oil to fire, if it wasn't building any, the truck wouldn't run


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post #5 of 7 Old 12-29-2010, 03:38 AM
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Take your oil filter off and look up inside there to the right there is a little hole with a disc ,washer, and spring if it is not there than that is your problem on the early trucks this disk is held in by just being staked in on the newer trucks it has a snap ring, this is an oil bypass.
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post #6 of 7 Old 12-29-2010, 03:53 AM
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if that bypass was open, wouldn't it just not go thru the filter? Would still have pressure wouldn't it?

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post #7 of 7 Old 12-29-2010, 01:42 PM
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Quote:
Originally Posted by melmount View Post
if that bypass was open, wouldn't it just not go thru the filter? Would still have pressure wouldn't it?
It would have enough pressure to run the truck, On the gauge it would read Zero at Idle, and raise with RPM.

I agree with you though that a real mechanical gauge should be installed to see actual pressures
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