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Old 07-12-2012, 05:15 AM   #1
G_Loc
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Does the oil pressure sender usually fail high or low?

I received a "check oil" warning yesterday evening about 10 seconds after starting my car and immediately shut it down. Oil level was fine. I fired up the Torque app on my phone and with the car off, oil pressure was reading at 2.3 psi. I fired it up again. Oil pressure reading remained at 2.3 psi for a few seconds, then as right when the "check oil" warning came up, the reading jumped to about 50 psi. The lowest recorded oil pressure reading during my commute home was 32.4 psi.

Oil pressure sender starting to fail?
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Old 07-12-2012, 05:20 AM   #2
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Was the motor running rough or making noise?
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Old 07-12-2012, 05:20 AM   #3
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I believe they usually fail high.
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Old 07-12-2012, 05:21 AM   #4
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High. When mine stopped working, the oil pressure was pegged at like 111 or something like that.
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The cylinder heads became deformed because the air filter was so dirty they couldnt handle all the build up of air and oil coming through the air filter and the throttle body so i tried replacing the air tube with a cold air intake and i think the extra power blew out the cylinder heads and they crashed through valley pan into the crank. Then the crank spun hard and threw the pistons up to hard to cause a misfire

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Old 07-12-2012, 05:29 AM   #5
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They fail high. Sounds like your relief valve in your oil pump might be sticking. Keep an eye on it for sure.
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Old 07-12-2012, 05:34 AM   #6
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Maybe just the oil pressure sensor is bad (hopefully, you're that lucky). If not, maybe you can throw a UDP on there if you have to replace the oil pump.
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Old 07-12-2012, 05:40 AM   #7
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Put a new sending unit on right away and then if it even hiccups I'd replace the pump
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Old 07-12-2012, 05:50 AM   #8
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Quote:
Originally Posted by randy555...View Post
Was the motor running rough or making noise?

It was running smooth and no noises

Quote:
Originally Posted by svede1212...View Post
Put a new sending unit on right away and then if it even hiccups I'd replace the pump

I really really hope I luck out and its just the sending unit failing low. I don't have time at the moment to replace anything that requires more than an hour's worth of work. Of course, right now I'm in no financial position for a new short block either lol
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Old 07-12-2012, 05:53 AM   #9
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Quote:
Originally Posted by mchicia1...View Post
They fail high. Sounds like your relief valve in your oil pump might be sticking. Keep an eye on it for sure.

This... your symptoms sound like what i had a couple years ago and it was due to a stuck relief valve.

http://www.ls1gto.com/forums/showthr...783&highlight=
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Old 07-12-2012, 06:13 AM   #10
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Quote:
Originally Posted by G_Loc...View Post
It was running smooth and no noises



I really really hope I luck out and its just the sending unit failing low. I don't have time at the moment to replace anything that requires more than an hour's worth of work. Of course, right now I'm in no financial position for a new short block either lol

The last person that didn't immediately stop and make sure it wasn't the pressure reliev valve ended up doing a rebuild.
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Old 07-12-2012, 06:24 AM   #11
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Another reason it's nice having a separate sending unit and gauge in my car. The one's using the factory sender and just wiring their gauge in aren't doing a lot more than what the car came with.
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Old 07-12-2012, 06:26 AM   #12
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Quote:
Originally Posted by mchicia1...View Post
They fail high. Sounds like your relief valve in your oil pump might be sticking. Keep an eye on it for sure.

Quote:
Originally Posted by Fourman...View Post
This... your symptoms sound like what i had a couple years ago and it was due to a stuck relief valve.

I had the same problem. Relief valve got stuck in front of a Dunkin Donuts the day before Christmas. Christmas day I was dropping my oil pan.
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Old 07-12-2012, 11:37 PM   #13
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If you see that check oil light...shut it down immediately. Do not wait until you can turn off the road. I tried limping it to an exit...this is what happened.
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Old 07-13-2012, 03:12 AM   #14
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I vote oil pump/pressure relief valve.

Have you picked out a cam yet? You're going to be right there, might as well.
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Old 07-13-2012, 03:27 AM   #15
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Quote:
Originally Posted by 87LC2...View Post
I vote oil pump/pressure relief valve.

Have you picked out a cam yet? You're going to be right there, might as well.

Already running an aftetmarket cam

I should have replaced the damn pump while I was in there
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Old 11-16-2012, 09:33 AM   #16
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Update: I replaced the sensor shortly after creating this thread and monitored my oil pressure daily. Pressure was averaging 30 - 32 at warm idle.

Well last night after leaving work, I had to make a quick stop about a mile down the road. When I started it up again, I got the dreaded check oil warning. Oil level was fine and I heard no weird noises for the few seconds the engine was running. Had it towed home and pushed it into the garage for tear down. Hopefully I can get it up and running again by Thanksgiving.
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Old 11-16-2012, 09:55 AM   #17
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Quote:
Originally Posted by G_Loc...View Post
Update: I replaced the sensor shortly after creating this thread and monitored my oil pressure daily. Pressure was averaging 30 - 32 at warm idle.

Well last night after leaving work, I had to make a quick stop about a mile down the road. When I started it up again, I got the dreaded check oil warning. Oil level was fine and I heard no weird noises for the few seconds the engine was running. Had it towed home and pushed it into the garage for tear down. Hopefully I can get it up and running again by Thanksgiving.

Time for an Texas Speed LS6 pump!
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Old 11-16-2012, 10:09 AM   #18
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Quote:
Originally Posted by TheRocket...View Post
Time for an Texas Speed LS6 pump!

Na, I ordered a Melling. $70 shipped
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Old 11-16-2012, 10:12 AM   #19
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Na, I ordered a Melling. $70 shipped

Nice grab and great price!
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Old 11-16-2012, 10:21 AM   #20
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Mine failed high. At first, it started reading 4-5 PSI when the car was off, then one day it was reading a fairly accurate number, only +70PSI....then one day it just stuck at 121PSI. Good times.
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Old 11-19-2012, 06:23 AM   #21
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Got the oil pump out last night. Pressure relief valve was stuck partially open.
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Old 11-19-2012, 06:26 AM   #22
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at least it wasnt stuck partially closed.
how long did it take you to swap it out ?
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Old 11-19-2012, 06:59 AM   #23
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Quote:
Originally Posted by elephantrider...View Post
at least it wasnt stuck partially closed.
how long did it take you to swap it out ?

Hard to say how long it took. I slowly worked on it over the course of 2 days and spent some time cleaning the engine bay. I also wasted an hour yesterday because the harmonic balancer removal tool I rented was missing a critical piece so I had to chase down another one. New pump comes in on Wednesday.

I'm sure replacement can be accomplished in 4 hours or so, assuming you don't run into any issues.
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Old 11-19-2012, 07:10 AM   #24
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okay yeah - just curious how long that swap is as a stand alone
process. i changed mine out when we did h/c work a few months
ago.
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Old 11-26-2012, 05:36 AM   #25
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Up and running again. Engine sounds fine and pressure at idle is a tad bit higher than before.
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Old 09-08-2013, 10:04 PM   #26
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Quote:
Originally Posted by Steel Chicken...View Post
Mine failed high. At first, it started reading 4-5 PSI when the car was off, then one day it was reading a fairly accurate number, only +70PSI....then one day it just stuck at 121PSI. Good times.

Sorry for the gravedigging, but I found my oil pressure hovering right around 120PSI as monitored through the Torque app (even while at operating temperatures ~200F). No abnormal smells, sounds, warning lights, or performance were detected.

I'll log some data tomorrow as well, but it sounds like a new sender is in my future!
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