**oil Pressure Problem** - 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 10-22-2005
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**oil Pressure Problem**

Ok i havent posted in a while, works been killing me. I have spoken to a few of you on AIM about my problem, but im looking for a little more help.

Ok from what i understand the oil pressure gauge is basically a light on the dash, nothing else. Untill you get a low pressure reading. My oil pressure gauge is very jumpy. It goies from perfect to all the way low CONSTANTLY. Basically it flickers a little bit. If i rev the engine back up it goes to perfect. It doesnt do it at a cold idle, but will after a long drive. I have been told it could be one of two things, 1 the oil sender unit (sensor?) , or 2 the oil pump in the pan. Im not to sure what it is exactly. The engine runs like it always has. So im lost.....any help please.....i cant afford to lose the truck!
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Old 10-22-2005
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It could be a real oil pressure problem or it could be the oil pressure sending switch. The odds are on the switch - they were very unreliable during the years close to your 2000.

If it was my truck, I'd get a new switch in there pronto. Ignoring a possible oil pressure problem could cost you a very expensive engine.
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Old 10-23-2005
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wow sounds just like my answer eh CJ......
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Old 10-23-2005
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Quote:
Originally Posted by Redneckstone
wow sounds just like my answer eh CJ......
Hey now!

I wasnt saying you wernt right, i was just puting it out there to more people.........hoping it wouldnt be a bad thing.

Oh well, looks like i gotta get the new switch first, and have them check the oil system.....thanks guys!

CJ
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Old 10-23-2005
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Sounds like a perfect opportunity to make it into a real gauge. If you're going to replace the switch, you might as well replace it with a real oil pressure sending unit and do the mod to the gauge cluster. Then you'll get a real pressure reading.
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Old 10-23-2005
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Quote:
Originally Posted by FireRanger
Sounds like a perfect opportunity to make it into a real gauge. If you're going to replace the switch, you might as well replace it with a real oil pressure sending unit and do the mod to the gauge cluster. Then you'll get a real pressure reading.
highly recommend auto meter gauges and piller pod do it right
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Old 10-23-2005
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Here is mine, sport comp electric oil pressure and voltmeter.
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Old 09-14-2006
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i have a 99, my oil pressure is/was messing up and jumping, a shop told me the pumps goin out, and if they replaced it, a bigger problem would just break the new one..

it was caused by me getting stuck frame deep i think.. but im running 20-50 oil now and its been fine, my issue is the valves click, and other stuff, my engines on a limited life span haha

but i want another opinion, they told me 10-20k other people r telling me sooner and to check like the oil intake pipe and stuff, the shop wants to charge me 5g for a new engine including install, i can go to ford and get a new one for 2g...


anyways, thats my problem, try heavier oil if the new gauge does the same thing
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Old 09-15-2006
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how hard is it to put in the oil pressure gauge???
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Old 09-16-2006
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Not that hard, but this will help......

"SEARCH"
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Old 09-18-2006
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haha
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Old 11-04-2006
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Its takes no more than 5 minutes... My truck had a jumpy oil pressure guage for the longest.. I replace the sending unit and it fixed it.. Its on the passenger side of the engine bay near the back screwed into the block..
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Old 11-04-2006
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I've had same problem since truck was new. If you look at your rpm's when this is happening you'll notice they are below 500. The truck is stalling. If you take your foot off the brake or tap the gas it comes back. It's also wierd because it seems to only happen when temp outside is 60 to 70 and during season change??? Weird! Also After a long drive and then your coasting to a stop light.I don't worry about it anymore. Wants temp gets colder doesn't happen or in summer when hotter it goes away. I think it's program issue for computer wit temp change.
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Old 11-04-2006
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holy year old topic
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Old 11-04-2006
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lol
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Old 11-04-2006
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Yeah, but people getting a 3.0 ranger don't know about it . And it freaks you out when it happens.
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Old 01-23-2010
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Quote:
Originally Posted by FireRanger View Post
Sounds like a perfect opportunity to make it into a real gauge. If you're going to replace the switch, you might as well replace it with a real oil pressure sending unit and do the mod to the gauge cluster. Then you'll get a real pressure reading.
Just What is the oil pressure mod you can do to the gauge cluster? I have been searching but not coming up with anything.

Thanks!!
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Old 01-23-2010
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Quote:
Originally Posted by Daily Driver View Post
Just What is the oil pressure mod you can do to the gauge cluster? I have been searching but not coming up with anything.

Thanks!!
For a 1995 Ranger, it is possible to jump out a 20 ohm resistor on the back of the cluster and substitute a PS60 oil pressure sending unit for the OP switch on the engine. Then the factory gauge will show actual pressure changes instead of merely indicating pressure vs no pressure.

Here's a how to for a 1993 Ranger. Although the 95 cluster is quite different from 94 and earlier, this same general procedure will work for a 95 OP gauge if the correct resistor is jumped.
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Old 01-24-2010
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Quote:
Originally Posted by rwenzing View Post
For a 1995 Ranger, it is possible to jump out a 20 ohm resistor on the back of the cluster and substitute a PS60 oil pressure sending unit for the OP switch on the engine. Then the factory gauge will show actual pressure changes instead of merely indicating pressure vs no pressure.

Here's a how to for a 1993 Ranger. Although the 95 cluster is quite different from 94 and earlier, this same general procedure will work for a 95 OP gauge if the correct resistor is jumped.
Thanks for the start rwenzing. Now to find the info for my vehicle...

I thought I had heard something like this for the voltage too, sound familiar? Or the temp gauge? Or are these supposed to be accurate? Mine seem awfully consistent.

Last edited by Daily Driver; 01-24-2010 at 02:06 AM. Reason: Add Info
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Old 01-24-2010
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Your voltmeter and coolant temp are "real" gauges working from variable voltage across the windings. The input to the fuel level gauge is electrically damped to keep the needle from swinging wildly with fuel slosh but the gauge is real.
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  #21  
Old 01-24-2010
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Thanks. They do seem to change some so I thought so. I didn't know if there was a way to give them a better range. But I guess my truck is consistent, which is good. I need to go into the cluster when the weather warms up anyway to replace some lights, so I'll do it then.

V8 swap, that is what it really needs. Nice. Too bad you can't just drop a 3.4 into it.
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  #22  
Old 03-20-2010
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sorry to bring up a semi old thread but can you tell mo how you would go about doing this on a 02 cluster
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Old 03-20-2010
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Quote:
Originally Posted by Trailhead_273 View Post
sorry to bring up a semi old thread but can you tell mo how you would go about doing this on a 02 cluster
I assume that you are talking about converting a 2002 cluster to a real OP gauge. The stock 2002 OP gauge cannot be converted by any simple means.

However, there is another way. It is possible to install the guts of a 95 Ranger/Explorer OP gauge into a 97~2003 Ranger cluster. Do that and drive it with a PS60 sending unit and it will be a real gauge. The PS60 SU is too large to fit in the same location as your 4.0's factory on/off switch but it could be remote mounted. The 3.0 guys have a little more room around the stock switch, so it should be easier to convert those to the PS60 SU.

I have a 95 Ranger OP gauge movement in my 2003 cluster and it works well. The Ford schematics seem to suggest that an OP gauge from a 96 Ranger/Explorer might also work to do this conversion but I haven't tried one of those.
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