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  #1  
Old 08-28-2018, 05:07 PM
DTewell DTewell is offline
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Default Oil pressure gauge

Why would my oil pressure gauge constantly register low oil pressure but I have plenty of oil? Just traveled (mostly on interstate) for close to five hours today and gauge very seldom showed semi normal. Oil sending unit, oil pump malfunction or bad gauge. PS I have a 93 Ranger. Any help greatly appreciated. TIA.
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Old 08-28-2018, 05:32 PM
Dirtman Dirtman is offline
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Default Re: Oil pressure gauge

The important thing is you took proper precaution and ignored it for 5 hours of driving.

What engine and how many miles are on it? Are you using the correct weight oil? Did the issue appear suddenly or has it been like this for a while?

The sending units are cheap enough that you could start by just replacing that. If the pressure reads normal again you solved the issue. If not time to test the oil pressure with a mechanical guage to see if there is a real problem like a failing pump. I certainly dont recommend driving much more until you fix the issue though, unless your looking for an excuse to replace the engine.
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Old 08-29-2018, 07:04 AM
DTewell DTewell is offline
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Default Re: Oil pressure gauge

It has been that way for quite awhile. Truck has just over 100K miles but engine was replaced before I bought it and don't know how many miles on the engine. How do I test the pressure if the sending unit replacement does not cure the problem?
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Old 08-29-2018, 07:26 AM
djfllmn djfllmn is offline
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Default Re: Oil pressure gauge

Quote:
Originally Posted by DTewell View Post
It has been that way for quite awhile. Truck has just over 100K miles but engine was replaced before I bought it and don't know how many miles on the engine. How do I test the pressure if the sending unit replacement does not cure the problem?
that sending unit is just a low pressure switch. the gauge is a dummy gauge. i think if its above 8psi it reads right in the middle, below that its pegged on L. you need to check the wiring
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  #5  
Old 08-29-2018, 08:51 AM
KenHigg KenHigg is offline
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Default Re: Oil pressure gauge

Seems the thing to do is pull the sensor and put a gauge on it. Or if you want, stick in a new sensor. If it comes up you're good, if not you're back where you started needing to put a gauge on it...
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Old 08-29-2018, 04:06 PM
dvrich dvrich is offline
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Default Re: Oil pressure gauge

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Originally Posted by djfllmn View Post
that sending unit is just a low pressure switch. the gauge is a dummy gauge. i think if its above 8psi it reads right in the middle, below that its pegged on L. you need to check the wiring

100% correct......if the oil pressure gauge is reading anything other than half scale or pegged to the left, something in the sensor or gauge is off.
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Old 08-29-2018, 06:22 PM
Dirtman Dirtman is offline
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Default Re: Oil pressure gauge

I always wondered why they didn't just use something like a rheostat switch that could at least read pressure in vauge incriments instead of putting a guage on a switch made for an on/off idiot light. Its like giving you a speedometer that only works if your doing 55.

Last edited by Dirtman; 08-29-2018 at 06:24 PM.
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Old 08-30-2018, 05:11 AM
dvrich dvrich is offline
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Default Re: Oil pressure gauge

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Originally Posted by Dirtman View Post
I always wondered why they didn't just use something like a rheostat switch that could at least read pressure in vauge incriments instead of putting a guage on a switch made for an on/off idiot light. Its like giving you a speedometer that only works if your doing 55.

Ford eliminated the real gauge due to an alarming number of morons who were bringing their trucks in for warranty service.......they had no idea oil pressure varies with engine speed.
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Last edited by dvrich; 08-30-2018 at 09:01 AM.
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Old 08-30-2018, 05:51 AM
djfllmn djfllmn is offline
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Default Re: Oil pressure gauge

I know on my 68 T-bird. the oil pressure sending unit is on the top rear of the motor, already where there is the least amount of pressure, if I'm stopped in traffic it is not uncommon for the gauge to peg on L, almost every older ford is like that hence why they went to a switch
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