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Author Topic: Oil Pressure spike  (Read 1662 times)

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road2damascus

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Oil Pressure spike
« on: May 30, 2011, 09:01:55 PM »
Here's one that has happened several times now. My oil pressure gauge pins out past 80 on the in dash gauge after driving 30 minutes or more. This is at speeds of up to 60mph. I push the clutch and it floats back down. I let out he clutch and it goes back to 80 plus. The sending units that have gone bad on me in other cars/trucks have all pinned out at max pressure and stay there no matter what rpm. Driving short distances it stays within 40-60 psi. What do you guys make of this?

94 Jeep Wrangler 2.5 5spd 85,000 miles. I use AMSOIL SAE 0W-30 Signature Series 100% Synthetic Motor Oil and a AMSOIL Ea Oil Filter.
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Offline FourbangerYJ

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Re: Oil Pressure spike
« Reply #1 on: May 30, 2011, 09:05:19 PM »
More than likely the sending unit is going bad. I'm on my 3rd one. I carry a spare with me.
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Offline grumpygy

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Re: Oil Pressure spike
« Reply #2 on: May 30, 2011, 09:10:27 PM »
Sewnding unit.  My 94 scared me bad when It did that.  Was towing a Ford Courier home behind the jeep when it jumped like that.  Lucky I had a manual gauge I could put on to check what it really was.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline Jeffy

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Re: Oil Pressure spike
« Reply #3 on: May 30, 2011, 09:14:29 PM »
Sounds like when mine went out.  At idle it was fine.  Increase the RPM's the slightest and it would shoot up.  Replacing the sender fixed it.
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road2damascus

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Re: Oil Pressure spike
« Reply #4 on: May 30, 2011, 09:29:23 PM »
Pretty impressive fellas. First response was in 3 minutes, second in 8, and the third in 12. Thank you. 911 doesn't even respond that fast!  :roflol:
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Offline neale_rs

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Re: Oil Pressure spike
« Reply #5 on: May 31, 2011, 08:10:26 AM »
Mine shoots up like that too. I've decided to leave it that way for now.
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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Offline jfrabat

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Re: Oil Pressure spike
« Reply #6 on: May 31, 2011, 08:27:00 AM »
Mine did that as well; sending unit was the culprit.  Would be fine at idle, but if you so much as LOOKED at the throttle, it would shoot up.  Sometimes it would work, and then it would start doing it again.  New unit fixed the issue.
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'94 YJ 2.5L with 4" RE lift, Superwinch EPi9.0, FoMoCo e-Fan, SD30 and SD35 w/ARB-5.13, 165A alt., 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Hydroboost

Offline FourbangerYJ

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Re: Oil Pressure spike
« Reply #7 on: May 31, 2011, 04:23:01 PM »
Just becareful when you swap them. That brass elbow can break. It's a royal PITA to replace that!
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Scott~

Using tools you have not used in a while is like shaking hands with old friends. :nod:

Offline grumpygy

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Re: Oil Pressure spike
« Reply #8 on: May 31, 2011, 05:45:42 PM »
Quote from: neale_rs on May 31, 2011, 08:10:26 AM
Mine shoots up like that too. I've decided to leave it that way for now.

Real easy to fix I woud take care of it.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline neale_rs

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Re: Oil Pressure spike
« Reply #9 on: June 01, 2011, 07:43:30 AM »
I fixed it once and it lasted less than a year.  Just not worth doing again ... as long as it shows some pressure!
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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Offline jfrabat

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Re: Oil Pressure spike
« Reply #10 on: June 01, 2011, 12:40:41 PM »
Quote from: neale_rs on June 01, 2011, 07:43:30 AM
I fixed it once and it lasted less than a year.  Just not worth doing again ... as long as it shows some pressure!

That's a good point; my last one also lasted less than a year...  We'll see how long this one lasts!
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'94 YJ 2.5L with 4" RE lift, Superwinch EPi9.0, FoMoCo e-Fan, SD30 and SD35 w/ARB-5.13, 165A alt., 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Hydroboost

Offline FourbangerYJ

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Re: Oil Pressure spike
« Reply #11 on: June 01, 2011, 04:07:55 PM »
Both of mine leaked oil pretty good when they failed. So I had to replace it.
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Scott~

Using tools you have not used in a while is like shaking hands with old friends. :nod:
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