Oil Pressure Reading
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Advanced
Joined: Sep 2003
Posts: 61
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From: Arlington Texas
Oil Pressure Reading
Wife's 02 350 with 53,000 miles shows 80 psi on oil guage as soon as engine is started. Doesn' move off 80. Is that normal or does she have a bad oil sensor unit ?.
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
Sounds like your sensor is shot. Scroll through the gauges menu in the DIC and see what the oil pressure is reading in digital format. If it's pegged at the highest value (I think it's 130 psi but I'm not certain) and never moves your sensor is probably gone. Have you had any recent work done on your car?
If it is your sensor it's a pretty simple fix. You just pull the intake manifold and you have easy access.
If it is your sensor it's a pretty simple fix. You just pull the intake manifold and you have easy access.
Last edited by cdkcorvette7; Jan 4, 2012 at 01:23 PM.
Team Owner
Joined: Jul 2006
Posts: 22,109
Likes: 4,137
From: Kannapolis NC
Search "oil pressure sensor replacement". There are three methods with pictures and a couple of videos. You choose. But using search is a big help with issues like this. It's been posted hundreds of times.
I just looked up your prior posts, you've had most of the common problems with your C5, haven't you? This is another in that line.
I just looked up your prior posts, you've had most of the common problems with your C5, haven't you? This is another in that line.
Last edited by 65GGvert; Jan 4, 2012 at 12:11 PM.
Burning Brakes
Joined: Oct 2007
Posts: 1,093
Likes: 33
From: Morristown TN
I have posted this before but I am positive the sender ets shorted out when it rains and water leaks down right on top of it. if you open the hood with lots of water on it.
I replaced mine and it worked fine and decieded to clean the engine good and as soon as I started it the pressure pegged again.
took it back to autozone and got a new one and installed it
wile the engine was running I squirted water on it and it pegged.
next time I installed it I covered the connector with clear silicone and did the test again and it did not fail
I have now put 100,000 miles on it with that same sensor and never had another problem
I may have gotten lucky and got a good sensor but i am almost positive its a water issue shorting them out
I replaced mine and it worked fine and decieded to clean the engine good and as soon as I started it the pressure pegged again.
took it back to autozone and got a new one and installed it
wile the engine was running I squirted water on it and it pegged.
next time I installed it I covered the connector with clear silicone and did the test again and it did not fail
I have now put 100,000 miles on it with that same sensor and never had another problem
I may have gotten lucky and got a good sensor but i am almost positive its a water issue shorting them out
Tech Contributor
Joined: Jan 2007
Posts: 19,240
Likes: 1,091
From: Dyer, IN
I have posted this before but I am positive the sender ets shorted out when it rains and water leaks down right on top of it. if you open the hood with lots of water on it.
I replaced mine and it worked fine and decieded to clean the engine good and as soon as I started it the pressure pegged again.
took it back to autozone and got a new one and installed it
wile the engine was running I squirted water on it and it pegged.
next time I installed it I covered the connector with clear silicone and did the test again and it did not fail
I have now put 100,000 miles on it with that same sensor and never had another problem
I may have gotten lucky and got a good sensor but i am almost positive its a water issue shorting them out
I replaced mine and it worked fine and decieded to clean the engine good and as soon as I started it the pressure pegged again.
took it back to autozone and got a new one and installed it
wile the engine was running I squirted water on it and it pegged.
next time I installed it I covered the connector with clear silicone and did the test again and it did not fail
I have now put 100,000 miles on it with that same sensor and never had another problem
I may have gotten lucky and got a good sensor but i am almost positive its a water issue shorting them out
1) The OPS was changed by someone cutting a hole in the cowl, and it was not sealed properly.
2) The OPS was changed, and the connector seal was lost/damaged....and could be combined with the above.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 326
From: CA.
St. Jude Donor '13-'14-'15
Most likely a bad sensor---quite common--Not that easy a fix--whole manifold has to come off---While it's off think about replacing the intake valley with a LS6 style Look inside your intake manifold while off with a flashlight--you'll be shocked at the amount of oil that may get sucked into it via your PCV system--resaon for all the catch can business and products availiable--If you have a stockish engine just a valley change ($75) should do- but if you have a midded engine (cam/hds/hdrs) you may want to install a catch can as well
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Thread Starter
Advanced
Joined: Sep 2003
Posts: 61
Likes: 0
From: Arlington Texas
Oil Pressure Question
Thread Starter
Advanced
Joined: Sep 2003
Posts: 61
Likes: 0
From: Arlington Texas
Oil Pressure Question
Sounds like your sensor is shot. Scroll through the gauges menu in the DIC and see what the oil pressure is reading in digital format. If it's pegged at the highest value (I think it's 130 psi but I'm not certain) and never moves your sensor is probably gone. Have you had any recent work done on your car?
If it is your sensor it's a pretty simple fix. You just pull the intake manifold and you have easy access.
If it is your sensor it's a pretty simple fix. You just pull the intake manifold and you have easy access.
Thread Starter
Advanced
Joined: Sep 2003
Posts: 61
Likes: 0
From: Arlington Texas
Oil Pressure Question
Search "oil pressure sensor replacement". There are three methods with pictures and a couple of videos. You choose. But using search is a big help with issues like this. It's been posted hundreds of times.
I just looked up your prior posts, you've had most of the common problems with your C5, haven't you? This is another in that line.
I just looked up your prior posts, you've had most of the common problems with your C5, haven't you? This is another in that line.
Racer
Joined: Oct 2007
Posts: 294
Likes: 0
From: High Desert Southern California
I just finished replacing my oil pressure sending unit with a brass body one from Rock auto. I used the intake manifold removal approach. Not too bad, it took me about 16 hours but I went very slowly. I replaced the intake gasket set from Napa at $26. Once the manifold is off and cleaned up it goes together quickly. Only special tool required is the fuel line disconnect, which is available at any auto parks store for just a few bucks. Good luck.
