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 Post subject: "Check oil" Light
PostPosted: Fri Sep 07, 2018 3:55 am 
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Joined: Tue Sep 04, 2018 12:57 pm
Posts: 8
Location: Atlanta
Hi all, I recently picked up a 2011 Caprice 9C1 that had an LS3 swapped into it. When I got it it was throwing a few codes but I got them all figured out. One of the codes was P0521, so I replaced the oil pressure sensor and haven't had the CEL pop back up.

But after Driving the car around a bit today, I noticed when braking the check oil light comes on, but it'll go away the second I touch the gas.

Has anybody experienced a similar issue?

Thanks in advance!

Oh and I removed the oil pressure sensor and checked to see if there was anything that could be causing an issue there, and did notice that there's a noticeable piece of the valley pan gasket visible in that port.


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 Post subject: Re: "Check oil" Light
PostPosted: Fri Sep 07, 2018 6:10 am 
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Joined: Thu Nov 29, 2012 4:32 pm
Posts: 1751
Location: East Central Florida
I've never laid hands on an LS3, but I'm pretty sure it has a dipstick for measuring oil level like the L77 has. Have you checked the level for correct initial set and/or excessive oil consumption with the stick? Nothing obvious (smoke, drips, etc...) out of the tailpipes right?

The other thing if the engine's been swapped is any harness issues that you're aware of? Dinged insulation that might be on the sensor line grounding out perhaps, touching just barely enough that varying the car motion might cause a make/break on the wire? Yeah, I'm grasping at straws but if the car was a 9C1 in patrol service, strange things can happen to wire bundles....

Anyway, just my .02 worth. Tons of more knowledgeable folks here then me!

Thanks
Eric

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System Manager and your tourguide for the day. Caprice Alumni, former owner of a 2011 Caprice 9C3 with a Rotofab CAI and front radiator cover, 3.45 LSD Camaro rear diff, Chris Henry performance tune, G8 GT 18" Enkei rims w/Holden lions, custom SLP axle-back muffler set with tips, Holden WM Caprice factory spoiler, Holden SSV leather steering wheel and leather shift knob, Whelen Alpha-12Q airhorn amp. G8 GT rear seat swap, AVS Ventshades.


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 Post subject: Re: "Check oil" Light
PostPosted: Fri Sep 07, 2018 11:01 am 
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Joined: Tue Sep 04, 2018 12:57 pm
Posts: 8
Location: Atlanta
I have checked the oil and it seems a little high. I'm honestly not sure on the wiring but I'll follow everything tomorrow. Thanks for the tip!


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 Post subject: Re: "Check oil" Light
PostPosted: Fri Sep 07, 2018 1:57 pm 
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Joined: Tue Jun 13, 2017 4:35 am
Posts: 195
Location: Ottawa, ON Canada
That gasket should be replaced. You are probably losing pressure that way. At idle, the pump probably can't keep up with the leak but able to bring it back up at higher RPM but is probably still lower than it should be. It's leaking into the valley so that's why you're not seeing an oil loss.

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 Post subject: Re: "Check oil" Light
PostPosted: Wed Sep 12, 2018 4:00 am 
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Joined: Tue Sep 04, 2018 12:57 pm
Posts: 8
Location: Atlanta
So i've changed the oil, put a mechanical pressure gauge on and i was seeing 20psi at cold idle. I put the stock sender back on, let the car warm up and plugged in a bluetooth obd2 scanner, and was monitoring everything using torque pro.


at idle i was seeing 4-10psi, and under light load it was at 20 psi. Getting on it a little bit i saw as high as 37 psi.


Here's my assumption, and i'll confirm this weekend when i drop the oil pan:

The guys i bought the car from saw the p0521, assumed it was a bad oil pump, swapped it out but pinched the O-Ring, this caused an actual low oil pressure issue, and here I am trying to figure it all out.

If anybody has any other suggestions they'd be much appreciated :)


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 Post subject: Re: "Check oil" Light
PostPosted: Wed Sep 12, 2018 4:35 am 
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Joined: Tue Jun 13, 2017 4:35 am
Posts: 195
Location: Ottawa, ON Canada
Another thought. If the pump was replaced with a regular LS pump, it will be low. I did that mistake on another vehicle and when the oil is older, the pressure is too low and triggers the code. The pump is supposed to be a high pressure and volume for DOD engines.

I still think it's the seal. If the PO didn't remove the valley cover during the swap, then that's why the problem never got fixed.

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 Post subject: Re: "Check oil" Light
PostPosted: Wed Sep 12, 2018 5:53 pm 
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Joined: Tue Sep 04, 2018 12:57 pm
Posts: 8
Location: Atlanta
Car has an LS3 swap, so no DOD.

I've decided the easiest method of fixing the oil pressure issue is to take it into a shop, and have them replace the oil pump.


Since they're already in there, I figured, why not swap the Cam as well :)


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 Post subject: Re: "Check oil" Light
PostPosted: Wed Sep 12, 2018 9:36 pm 
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Joined: Sat Feb 07, 2015 8:31 pm
Posts: 1653
Location: Pearland, Texas
IIRC, there's also an issue with some LS engines, and I think it is the LS3, where one of the oil pump pickup bolts can work loose, causing oil pressure issues. Seems to be an issue on the Truck line. So replacing the pump should get that issue fixed, if it is the problem.

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Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
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 Post subject: Re: "Check oil" Light
PostPosted: Thu Sep 13, 2018 2:28 am 
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Joined: Tue Sep 04, 2018 12:57 pm
Posts: 8
Location: Atlanta
CrashTestDummy wrote:
IIRC, there's also an issue with some LS engines, and I think it is the LS3, where one of the oil pump pickup bolts can work loose, causing oil pressure issues. Seems to be an issue on the Truck line. So replacing the pump should get that issue fixed, if it is the problem.



Welp. Just my luck, I looked at the oil I drained yesterday. There was copper flakes in it, so looks like motor is going into surgery soon.

Gonna have the block rebuilt


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 Post subject: Re: "Check oil" Light
PostPosted: Fri Sep 14, 2018 2:21 pm 
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Joined: Sat Feb 07, 2015 8:31 pm
Posts: 1653
Location: Pearland, Texas
Well now you have an opportunity to verify the engine and hopefully clear up all the other issues that this system seemed to have lurking for you. ;)

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Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
Do YOU have my SPID?


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