Oil pressure gage drop at idle! - Diesel Forum - TheDieselStop.com
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6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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Old 10-06-2011, 03:52 PM   #1 (permalink)
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Oil pressure gage drop at idle!

My original problem was the check engine light coming on at idle and the oil pressure gage dropping to zero, but when I hit the gas everything would be normal. It runs great, but has a hard time starting. From the forums I figured it was the HPOP. I tore everything down and noticed a potential gasket leak so, but everything else looked great with the HPOP. I put everything back together, got her started and went on down the road. Same problem came back. My batteries are very old and don't hold a charge long at all. Can this check engine light on low oil pressure and hard starting be a battery issue? I also discovered I have an early 04 6.0l powerstroke which doesn't have the STC fitting on the HPOP.
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Old 10-06-2011, 03:59 PM   #2 (permalink)
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I'm sure others will chime in with more experience. But, my understanding is that the oil pressure indicator on the dash is hooked to a switch that closes at 8 psi. So, if it is working right your pressure could be going below 8. I think this would be the low pressure oil pump. However, it could just be the sensor. I don't know if the truck would run if your oil pressure actually dropped that low.

My understanding is also that bad batteries can can all sorts of electrical problems on these trucks, including ruining the FICM. Good idea to put good ones in.
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Old 10-06-2011, 06:34 PM   #3 (permalink)
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First thing you need to do is get a new set of 850CCA batteries in because the old one will KILL the FICM $300 to repair or $1100 from Ford then go from there to the next problem.
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Old 10-07-2011, 09:30 PM   #4 (permalink)
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You most likely need a high pressure pump. There is a ball bearing that falls out on the low pressure side of pump. When this ball bearing falls out, the oil bleeds back into crankcase instead of feeding high pressure pump.
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Old 10-07-2011, 10:15 PM   #5 (permalink)
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I don't believe the truck would be running w/ that HPOP ball bearing missing.
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Old 10-07-2011, 11:33 PM   #6 (permalink)
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Check that sensor, nasty oil or other garbage can plug it up keeping the oil and the pressure from it causing it to read improperly and as you already know the engine shut down is a protective feature.
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Old 10-08-2011, 05:22 PM   #7 (permalink)
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Quote:
Originally Posted by bismic View Post
I don't believe the truck would be running w/ that HPOP ball bearing missing.
It can, and will run with that ball missing...and the oil pressure gauge will show no oil pressure at idle. Have seen it 2 times. That ball is on the low oil pressure side, there is enough volume to feed the high pressure pump to allow engine to run but not enough make gauge register.
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Old 10-08-2011, 10:36 PM   #8 (permalink)
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Quote:
Originally Posted by djshum View Post
It can, and will run with that ball missing...and the oil pressure gauge will show no oil pressure at idle. Have seen it 2 times. That ball is on the low oil pressure side, there is enough volume to feed the high pressure pump to allow engine to run but not enough make gauge register.
Interesting - I had not seen that before.
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Old 10-26-2011, 03:37 PM   #9 (permalink)
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Just going through the same exact thing. I spent $5700 last year for new headgaskets, ARP studs, Bulletproof cooler, radiator etc. Now the engine was hard starting and my oil guage would fall to zero at stop lights. Getting a new HPOP, new FICM, new oil cooler and all for only $3900 for a truck that is worth $12000 (2004 Lariat). I hope it runs for another 150000 miles cause I am going to keep it.
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Old 10-26-2011, 04:21 PM   #10 (permalink)
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The oil pressure guage reads the low side of the system. I also thought the ball bearing was in the HPOP housing as a plug and would not let the vehicle run if missing. I guess we all learn something. You should get batteries for sure.
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Old 10-26-2011, 08:22 PM   #11 (permalink)
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I see this pretty often. Replace the sender, they often fail or leak. I install a new one with every oil cooler.
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