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Old 06-10-2006
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oil pressure gauge

On my 2.5ltr engine I have an odd occurance on the oil pressure gauge. Every day that I drive the truck the oil pressure needle doesn't move until the engine seems to be up to temp. Last I checked this is a pressure gauge, not a temp gauge. Usually at or about two miles into the drive the needle springs into life about half way up on the gauge. I can't figure out what would make this happen, got any ideas?
Thanks.
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Old 06-10-2006
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the oil pressure gauges in our trucks are just dummy lights, in gauge form. So they either show real LOW pressure, NORMAL, or real HIGH pressure.. no 'in the middles', thus why the needle doesnt move with acceleration, it may flicker from time to time, but thats about all ive seen from mine. There is a user on here "rwenzing' who has done a 'real oil pressure gauge' mod, im sure he'll eventually chime in
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Old 06-11-2006
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I might have written my question a little confusing. My concern is that my oil pressure doesn't work at all for 10-15 minutes or until it seems that the engine is warmed up. A low pressure would be good, but my needle is pegged to 0 until then.
I am thinking of changing the pressure transmitter, but I wanted to see if this has happened to anyone else? Or if anyone may know exactly where the transmitter is at?
Thanks.
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Old 06-11-2006
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yeah sounds like the oil pressure sending unit, Im not sure where exactly it is, but on the back top of the block somewhere is my guess..
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Old 06-11-2006
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The 3.0L oil pressure sending switch is in the block behind the passenger side cylinder head. It is much easier to see through the PS wheel well than from above.

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Old 06-11-2006
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His is the 2.5L 4cyl.
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Old 06-11-2006
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You're right, BJ. I was looking at your signature by mistake.

The Wiring Manual says that the 2.5L has the pressure sender on the DS rear of the cylinder head. The wire on the connector is dark green/white.
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Old 06-12-2006
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Quote:
Originally Posted by rwenzing
You're right, BJ. I was looking at your signature by mistake.

The Wiring Manual says that the 2.5L has the pressure sender on the DS rear of the cylinder head. The wire on the connector is dark green/white.
Thanks for your help. I'll see about changing that this week and see if it works out.
You wouldn't happen to know where the high pressure air conditioner cut off switch is? I thought it was near the radiator on the ds. I tried to change it, but the parts stores all give me the wrong size(same switch, just two wrench sizes too big).
Thanks again, Gary.
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Old 06-16-2006
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well my 2.3L oil pressure gauge loves to do the hokey pokey up and down, up and down. acceleration and i just changed my oil. whats going on sry if i hijack the thread.
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Old 08-16-2006
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My '98 XLT 2.5 is doing similar stuff. Oil Pressure gauge works fine until the motor is warm. Once the engine is warm the needle will bounce at idle for a while, then eventually quit all together at idle. It only works when I'm driving or have the RPMs up.

I replaced the Oil Pressure sending unit last week and it got worse, and now the needle shudders very slightly even while driving down the highway. I changed my oil and PCV Valve yesterday and it changed nothing.

This morning I bought an aftermarket Oil Pressure gauge that I'm going to 'T' into the cylinder head so I can monitor real oil pressure because I just don't trust the dummy light/gauge.

For you guys wanting to change your sending unit on the 2.5 liter, climb up over the top of the engine on the driver's side rear of the cylinder head, right next to the intake plenum. You'll see the funky shaped sending unit on the side of the cylinder head with 1 wire attached. It's easiest to get to from underneath the truck, but still a tight fit. I suggest doing it on a lift if you have one available.

I'll be doing my aftermarket gauge install today and will try to take some pics of it if I don't get too frustrated.
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Old 08-17-2006
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My wife's 2.3 does the same thing... I never did change the sending unit...
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