Oil Pressure Gauge/pump problem - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 12-25-2008
BigRedDog's Avatar
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Oil Pressure Gauge/pump problem

Hey guys,

I've recently noticed that after the truck has been sitting for a long period of time outside, the check gauge light stays on.. as well as the oil pressure gauge saying that there is absolutely no oil pressure in the engine.

This only happens in the cold temperature, and eventually after the truck runs for awhile the oil pressure gauge goes back to normal. I was wondering if this is a common problem on Rangers?

It worries me because when the the check gauge light goes on the truck does start more rough than normal...however it's only part of the time.

Thanks!
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Old 12-25-2008
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one thing about fords....

IF the sensor is reading above 8psi or somthing like that...it'll show 'nomal'. if it reads less, it'll go all the way down on the gauge. its a on/off gauge like aswitch.


hows your oil level?
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  #3  
Old 12-25-2008
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Oil pressure sending unit "N/O switch" needs to be replaced.
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Old 12-25-2008
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If you truly have no oil pressure you will hear the difference.


The engine will be very noisy.

My guess is your sender is toast.

Last edited by Blhde; 12-27-2008 at 07:16 PM.
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Old 12-27-2008
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Alright I bought a new oil pressure sensor sending unit.

I'm pretty sure the sensor is on the passenger side of the engine block near the transmission fluid? I can see a couple sensors and I'm honestly not sure which one is which, and I don't want to guess and then F up..

Can anyone give me like a more detailed description on where it is?

Thanks!
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Old 12-27-2008
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4.0L - Oil pressure sending switch is in the driver side of the block near the front. It is below the A/C compressor with a single green/white wire going to it.
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Old 12-29-2008
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Alright thanks guys I replaced the sending unit and everything works now!

Thanks again
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Old 12-29-2008
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Glad it fixed it. Mine does the same thing on my 2.5L when it is cold. I have a new one but am to lazy to go replace it.
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Old 12-29-2008
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Yeah to be honest it was kind of a pain to replace..it wasn't in exactly an easy spot to get to with a ratchet.

And of course I didn't have a 13/16" deep socket either..the only size I didn't have. haha.
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