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Engine Oil Pressure Gage?
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Postmaster
Joined: Dec 2003
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From: Dallas
Engine Oil Pressure Gage?
In the Ford Service Bible found on this web site, the following description of the Engine Oil Pressure switch appears:
"This switch controls the oil pressure gage on the instrument panel. When pressure is above 7 psi the gage will read normal and if the pressure drops below 6 psi the gage will read 0."
This means that the oil pressure gage on the instrument panel is worthless. It's only purpose is to keep people from complaining about low oil pressure. Any of us who attempt to pull a 12,000 trailer across the Rocky Mountains with 7 pounds of oil pressure is in for a surprise.
"This switch controls the oil pressure gage on the instrument panel. When pressure is above 7 psi the gage will read normal and if the pressure drops below 6 psi the gage will read 0."
This means that the oil pressure gage on the instrument panel is worthless. It's only purpose is to keep people from complaining about low oil pressure. Any of us who attempt to pull a 12,000 trailer across the Rocky Mountains with 7 pounds of oil pressure is in for a surprise.
Senior User
Joined: Jul 2003
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From: Northeastern Pennsylvania
Re: Engine Oil Pressure Gage?
Originally posted by Choctaw Bob
In the Ford Service Bible found on this web site, the following description of the Engine Oil Pressure switch appears:
"This switch controls the oil pressure gage on the instrument panel. When pressure is above 7 psi the gage will read normal and if the pressure drops below 6 psi the gage will read 0."
This means that the oil pressure gage on the instrument panel is worthless. It's only purpose is to keep people from complaining about low oil pressure. Any of us who attempt to pull a 12,000 trailer across the Rocky Mountains with 7 pounds of oil pressure is in for a surprise.
In the Ford Service Bible found on this web site, the following description of the Engine Oil Pressure switch appears:
"This switch controls the oil pressure gage on the instrument panel. When pressure is above 7 psi the gage will read normal and if the pressure drops below 6 psi the gage will read 0."
This means that the oil pressure gage on the instrument panel is worthless. It's only purpose is to keep people from complaining about low oil pressure. Any of us who attempt to pull a 12,000 trailer across the Rocky Mountains with 7 pounds of oil pressure is in for a surprise.
Lariat
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Joined: Jan 2003
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From: West Columbia, SC
just a thougt but i wonder what would happen if someone were to swap the oil pressure sending unit from ford to an International sending unit and see what happens. The oil pressure gauges in the Internationals read in psi and are dead on as far as accuracy. just wondering
BTW stock oil pressure gauges in Fords are like **** on a bull USELESS!
BTW stock oil pressure gauges in Fords are like **** on a bull USELESS!
Posting Guru
Joined: Oct 2003
Posts: 1,332
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From: Baltimore
I wonder if an earlier model SD, like a 99, worked the same way? If not, it maybe trying an earlier sending unit to see if it works. A International sender may not be compatible with Ford instruments.
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From: Colorado
I would guess it will take adding a resiter in-line if the sending unit is replaced. Question number one is does the wire from the guage come directly from the sending unit or through the computer?
A while back I saw a post about the Instrument cluster diags. You hold down the trip reset button while starting the vehicle then cycle through numerouse readings one of those could be an accurate pressure reading. I know it will give you barometric pressure, true rpms, speed and other codes that are yet to be fully defined by us on the forum.
A while back I saw a post about the Instrument cluster diags. You hold down the trip reset button while starting the vehicle then cycle through numerouse readings one of those could be an accurate pressure reading. I know it will give you barometric pressure, true rpms, speed and other codes that are yet to be fully defined by us on the forum.
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From: Dallas
Originally posted by RJB1
I would guess it will take adding a resiter in-line if the sending unit is replaced. Question number one is does the wire from the guage come directly from the sending unit or through the computer?
A while back I saw a post about the Instrument cluster diags. You hold down the trip reset button while starting the vehicle then cycle through numerouse readings one of those could be an accurate pressure reading. I know it will give you barometric pressure, true rpms, speed and other codes that are yet to be fully defined by us on the forum.
I would guess it will take adding a resiter in-line if the sending unit is replaced. Question number one is does the wire from the guage come directly from the sending unit or through the computer?
A while back I saw a post about the Instrument cluster diags. You hold down the trip reset button while starting the vehicle then cycle through numerouse readings one of those could be an accurate pressure reading. I know it will give you barometric pressure, true rpms, speed and other codes that are yet to be fully defined by us on the forum.
I will post again when I get done with photos.
Postmaster
Joined: Jan 2003
Posts: 4,417
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From: Durham, NC
Originally posted by Choctaw Bob
I bought a Auto Meter oil pressure gage. When I removed the Ford sending unit from the manifold between the oil filter and turbo, I discovered that the fitting was an AN type thread. Today I will get the parts and install the new gage. The Ford gage Sending unit must remain (put a T between the sending unit and manifold) because the sending unit must read oil pressure or the computer will shut the engine down...
I will post again when I get done with photos.
I bought a Auto Meter oil pressure gage. When I removed the Ford sending unit from the manifold between the oil filter and turbo, I discovered that the fitting was an AN type thread. Today I will get the parts and install the new gage. The Ford gage Sending unit must remain (put a T between the sending unit and manifold) because the sending unit must read oil pressure or the computer will shut the engine down...
I will post again when I get done with photos.
you can do that will eliminate putting a T on the sending unit, is
just ground the wire going to the OEM oil sending unit "switch".
Of course, you loose the safety feature, of the engine shutting
down with loss of oil pressure....
I changed out the OEM oil sending unit "switch", replacing it with an analog type of sending unit, and I can now see fluctuations
in oil pressure with my OEM gauge. This was on a Ranger 3.0L,
I'm sure the same thing will work on any Ford with the "IDIOT
LIGHT" oil pressure gauge. I've seen previously that there is a
20 OHM resistor in series with the gauge to the sending unit,
but when I pulled my instrument panel, I didn't have the resistor.
If you do have the resistor, you need to short it out with the analog sending unit...
Last edited by Bob Ayers; Feb 28, 2004 at 08:21 AM.