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  #1  
Old 04-05-2011, 08:54 PM
Ranger0015 Ranger0015 is offline
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Default oil gauge?

My stock oil gauge, in my 90 ranger has a red L and then normal in the middle and then a regular H at the other end, well the past 3 yrs since ive had and its been my dd, and the needle on that gauge has always been inbetween the n and o on normal, on the gauge, but just recently its now in between the r and m, sometimes on the a, the H is white so i assume if it got that high that its not gonna hurt anything, just as long as its not on the red L, anyway my question is why is it doing that? is my oil pump goin out?
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  #2  
Old 04-05-2011, 09:11 PM
FordDude1991 FordDude1991 is offline
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Default Re: oil gauge?

could be if you changed oil weight, what type of oil, how long the oil's been in the truck..
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Old 04-05-2011, 09:12 PM
WildlandFirefighter WildlandFirefighter is offline
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Default Re: oil gauge?

My Bronco does the same thing. I think it is the gauge. If the Oil pump was goin out you will keep losing OIL PSI.
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  #4  
Old 04-06-2011, 04:58 AM
Ranger0015 Ranger0015 is offline
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Default Re: oil gauge?

well i always run full synthetic 10w-30, the past winter i was running 5w-30 but i just did my oil change like 2-3 weeks ago and im back to 10w-30, and i dont have an oil psi gauge
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Old 04-06-2011, 05:48 AM
FireRanger FireRanger is offline
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Default Re: oil gauge?

The oil pressure gauge is not a gauge at all. It only has two settings, 0 or the middle. The oil pressure "sensor" is just a switch. At 7 PSI (I think) it closes. There is a resistor in the gauge cluster that makes the needle align with the middle of the normal range. So as long as there is more than 7 PSI, the gauge reads right there. It is physically incapable of reading anything other than 0 or middle.

If your gauge is changing, something is wrong with the gauge.
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Old 04-06-2011, 01:14 PM
Gumcrew2 Gumcrew2 is offline
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Default Re: oil gauge?

Quote:
Originally Posted by FireRanger View Post
The oil pressure gauge is not a gauge at all. It only has two settings, 0 or the middle. The oil pressure "sensor" is just a switch. At 7 PSI (I think) it closes. There is a resistor in the gauge cluster that makes the needle align with the middle of the normal range. So as long as there is more than 7 PSI, the gauge reads right there. It is physically incapable of reading anything other than 0 or middle.

If your gauge is changing, something is wrong with the gauge.
^^ Not necessarilly true, my guage on mine works like a REAL gauge, not the DUMMY gauge some got. At idle mine shows oil pressure around r-m, and if I rev it up or am under load driving pressure goes up accordingly.


I'd say get an oil pressure sending unit to be sure, it only take 2 seconds to swap it out. And of all the gauges to work, that's a pretty damn important one.

My gauge worked fine then showed low like yours, it was because a piston broke in half and a chunk was in the oil pan while oil blew up past the rings and burrrrrrrneeed away.

I fixed the gauge, then the pistons
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Old 04-06-2011, 01:22 PM
BrianR BrianR is offline
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Default Re: oil gauge?

The dummy gages started in the 93 model with the revised body style if my memory is correct I'm unsure about the pre 93 gauges.

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Old 04-06-2011, 01:34 PM
mdblitz mdblitz is offline
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Default Re: oil gauge?

My 2002 3.0 gauge needle starts wiggling after about a half hour of driving when I come to a stop sign or something. Anyone see that kind of thing?
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  #9  
Old 04-06-2011, 09:07 PM
Doctor Wily Doctor Wily is offline
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Default Re: oil gauge?

my 94 has a real gauge in it. it reads higher than i think it should too, lol.
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Old 04-07-2011, 06:43 AM
FireRanger FireRanger is offline
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Default Re: oil gauge?

My '91 had the dummy in it. My older '84 did not.
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  #11  
Old 04-07-2011, 06:25 PM
Ranger0015 Ranger0015 is offline
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Default Re: oil gauge?

FireRanger- dang i didnt know that, thanks for info!!
Gumcrew2- where is the oil sending unit?
And thanks for the help guys, just makin sure my truck isnt gonna go soon lol
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04 Mazda b3000 dual sport 2wd, stock for now hopefully lifting soon!
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  #12  
Old 04-07-2011, 07:36 PM
Gumcrew2 Gumcrew2 is offline
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Default Re: oil gauge?

Quote:
Originally Posted by Ranger0015 View Post
FireRanger- dang i didnt know that, thanks for info!!
Gumcrew2- where is the oil sending unit?
And thanks for the help guys, just makin sure my truck isnt gonna go soon lol
On my '83 the sendin unit is mounted on the driver side of the block, almost all the way to the rear, threads into the head itself with a 90* elbow fitting. ABout 1-2" from the firewall end of the motor.
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