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Old 07-10-2009, 04:39 PM   #1
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oil pressure / gauge

Hi all,


I have a 93 4 cyl, and when I start her up the oil pressure gauge pins to the right to 80. I searched and read different accounts of what "normal' oil pressure is and there are some different accounts, but I don't think that going all the way to the right and staying there is normal. What do I do? Am I going to do damage if I continue to drive it? The owners manual just says to watch out for low pressure, not anything about high pressure.

I checked my dipstick and I am ok, low but ok, close to needing to add oil. I don't know if that would have something to do with it.

I really wanted to drive her tonight (finally some good summer weather in VT!), but I don't want to damage anything.

Thanks in advance,

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Old 07-10-2009, 06:19 PM   #2
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99% of the time you just need to replace your oil pressure switch. Bring your oil to the full line on the dip stick. It doesn't sound like when you start it there are any unusual problems. Even with a new switch, it may go over to 80 but it will fall back to a normal 50-60 range once it warms up. The only real way to check your true pressure is to connect a real pressure gauge. The bottom line is you need a new pressure switch.

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Old 07-10-2009, 07:36 PM   #3
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thanks kik. I just went to the local parts store, got new oil and a filter, but they didn't have a mechanical oil pressure gauge. Is this something that I will need to special order? Is it a one size fits all device? Is it something I can install (I have the 2.5) without dumping all the oil - I want to change the oil and filter asap to see if it relieves some pressure.

What about the oil spring in the oil pump, the bypass? I have read it can stick...can this be cleaned/replaced without taking out the oil pan, oil pump, and all the headache that involves?

I am a novice mechanic, and got this jeep to play and learn for the summer months, but I don't want to take her out of summer commission while I undertake such a job.

Thanks for the input, if you have any relevant thoughts please pass them on!
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Old 07-10-2009, 07:50 PM   #4
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kik - where would I find the oil pressure switch? is this a switch I can find at most parts stores? how hard a job is it, like a fuse, or something else? Again, very novice, just want to get my head around what I need to do.

Thanks,
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Old 07-11-2009, 09:53 AM   #5
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Before you go taking everything apart, just order an oil pressure switch from JC Whitney or any other auto parts supplier. It might be listed as an oil sender switch. You probably won't pay more than 30.00 for it. The switch is on the passenger side towards the rear of the engine with an electrical connection at the top. When you get the new one you will see. It's easy to replace, just unscrew it. It should take 5 min. If you want a mechanical switch I would do a google search. But, if your jeep is running o'k right now just replace the switch. Oil pumps are pretty bullet proof. I doubt that's your problem. If your oil is not like mud your pressure won't be affected. You might need an oil change anyway,but, replace the switch. Another bottom line: If your jeep is running fine at this point REPLACE the oil pressure/sender switch.
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Old 07-11-2009, 11:22 PM   #6
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Quote:
Originally Posted by kik View Post
Before you go taking everything apart, just order an oil pressure switch from JC Whitney or any other auto parts supplier. It might be listed as an oil sender switch. You probably won't pay more than 30.00 for it. The switch is on the passenger side towards the rear of the engine with an electrical connection at the top. When you get the new one you will see. It's easy to replace, just unscrew it. It should take 5 min. If you want a mechanical switch I would do a google search. But, if your jeep is running o'k right now just replace the switch. Oil pumps are pretty bullet proof. I doubt that's your problem. If your oil is not like mud your pressure won't be affected. You might need an oil change anyway,but, replace the switch. Another bottom line: If your jeep is running fine at this point REPLACE the oil pressure/sender switch.
My oil pressure gauge bounces around...My fuel gauges does this as well. I think it may be a grounding issue with my gauge cluster.
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Old 07-12-2009, 07:27 AM   #7
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Hey just so you know the Jeep 4.0 oil pumps are not bulletproof and are known to wear and start loosing pressure around 150k. When this happens you will begin to have idle pressures of 10 t0 15 lbs or so. The fix for this is a new oil pump or a high volume oil pump (this is what I do). If you are worried about your pressure reading you can go to most auto store and get an external mechanical gauge and install it where your old sending unit was right by the distributor. You will need the end fitting to be 1/8" npt fitting IIRC.

As far as gauges bouncing I would definitely look at your grounds behind the dash
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Old 07-12-2009, 07:28 AM   #8
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On a 4.2L there is a sender, for knowing if oil pressure exists within the engine.
It is small & looks like it needs a special socket to install. It 's purpose is so the on board computer knows it's OK to let the engine run.

Also there is a pressure switch which is larger , & looks like a dome. This is for the gauge.

Both of these sensors are located on the passenger side of the engine block above the starter, They are connected with a "Tee".

A 4 cylinder may be different though. Not even sure if ti has both a pressure switch, & a pressure sender.

I would think Moojamboo needs a new sender.


Jeepin_Chuck on the other hand needs this;

Guages not working - JeepForum.com




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Old 07-12-2009, 08:21 AM   #9
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(1)= Tee
(2)= switch
(3)= sender

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Old 07-12-2009, 02:58 PM   #10
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Nice pic but since the Jeep is a 93 it should have the single plug sending unit on a tee next to the distributer above the starter. Same location the just started using the single unit sender in 92 I believe.

It should look like this
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Old 07-12-2009, 08:48 PM   #11
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i recently swapped it out my my 4cyc, was a real easy swap with the right tools since i have ac, but without ac it would be a 2 second job...
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Old 07-12-2009, 09:08 PM   #12
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ok the pic is gone now lets try this one
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Old 07-12-2009, 09:11 PM   #13
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btw i ordered mine from napa for like 40 dollars
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Old 07-13-2009, 05:03 AM   #14
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Quote:
Originally Posted by buckshot500 View Post


(1)= Tee
(2)= switch
(3)= sender

Oh damn, I got it wrong!






This is right, but may be for the 4.2L only, not the 4.0L

(1)= sender
(2)= tee
(3)= switch


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Old 07-22-2009, 11:35 AM   #15
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I'm having the same problem on my just purchased '92 .... I'll try the pressure switch ... first is my running lights, second is the windshield wipers / motor, 3rd i sthe speedometer .... then I'll go after the oil switch. This is a great site .... thanks for the input all
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Old 03-28-2011, 07:22 PM   #16
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I know it's old topic, but I had this same exact problem on an 02 Jeep Wrangler, as soon as you turn on the engine the oil pressure spikes to 80 psi. Replaced the Oil pressure switch which I got at Autozone for $45, pressure stabilized right away, now when I drive stays around 50.

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