oil guage going nutz - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 04-07-2008
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oil guage going nutz

when i drive for like 20min and stop at a light my oil gauge needle flicks like crazy but when i drive again its fine. Before i goto a mechanic i want to get some ideas so im not taken for a ride by this guy
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Old 04-07-2008
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oil pressure sending unit probably. mine does it too, just havent taken the time to get it fixed yet.
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Old 04-07-2008
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I wouldnt fix it I would just spring for real oil pressure gauges!
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Old 04-07-2008
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Your gauge is not a gauge anyway. It's a switch. The pressure gauges on later Rangers are actually on/off indicators and the "sender" is not a sender but just a pressure switch.

The tipoff on it being a switch is the needle doesn't move with RPM as it should with a real pressure sender.

The threshold of this switch is 6 PSI supposedly, but it can change over time.

There are therefore two possibilities: either your oil pressure at idle is hanging around 6 PSI, or the switch is going bad.

If you replace the switch and it persists, your idle oil pressure may be low when hot.

There is the remote possibility of different electrical malfunction, but it's unlikely.

If you replace the switch and the problem persists, then get your oil pressure hot at idle measured.
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Old 04-07-2008
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Had the same thing happen to the Xploder this winter, I was unfotunate and it ended up being the oil pump. I swapped out the switch and it still acted up. It was a costly repair but it is good now.

~HJ
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Old 04-07-2008
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I had that happen with an irratic idle- I was basically running off of 5 cylinders instead of 6.
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Old 04-07-2008
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its the sending unit or the oil pump my dad f150 did that we put a sending unit in it and it didnt work so we had to put in a oil pump in it.
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Old 04-07-2008
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Mine does the same thing.
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Old 04-07-2008
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any how to's or anything on how to change the switch?
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Old 04-07-2008
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Which engine, Peter? On the 3.0 it's on the back of the block on the passengers side. Kind of hard to get to but you can either lay across the engine and reach down, or take the passengers side tire and liner out and reach it from there easily.

It screws down into the block -- that is, the sensor is sticking up with wire coming in from the top.

On the 4.0 I don't know where it is.
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Old 04-08-2008
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3.0 john i think maybe this weekend when im off i may have to try and change this. How much does the switch usually run?
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Old 04-08-2008
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Probably $20 or thereabouts for the switch.

John's description is perfect for a 3.0L.
[4.0L (and 5.0L ) use the same switch but in a different location - driver side of the block below the A/C compressor.]

Here's a drawing of the 3.0L switch in the block behind the PS cylinder head:

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Old 04-08-2008
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I just saw the episode of The Office with your avatar in it, I always wondered what the heck that was lol
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Old 04-08-2008
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Quote:
Originally Posted by 2003stealthedge View Post
3.0 john i think maybe this weekend when im off i may have to try and change this. How much does the switch usually run?

I'm not sure about the price, Peter, but since it's only a switch I'm going to say $10-$20 max. I haven't bought one though so I can't say for sure. It could even be cheaper.
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Old 05-27-2008
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i have 2002 edge with a 3.0L thats a 5 speed and when i start off rough sometimes the oil guage goes crazy, but i just think that is because it is a 5 speed and i start out rough and it thinks i going to let it cut out.
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  #16  
Old 05-27-2008
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me too

This happened to me in my 03 ranger edge it turnned out to be a bad oil gauge sensor.
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