DougandBeth

So i just picked up my first C6 Grand Sport on Wednesday last week. Drove it for 1,100 miles and no issues. Idilling and on the highway I am at 40-60 PSI for oil pressure. Let the car sit in the garage for a day. Yesterday I go to take it out and it's literally pinned at 80 PSI when I start it. Stays like that for a good 10-15 minutes and then runs between 45-60 PSI even when at a red light. I push it on the highway a little and still creeps to 80. How did this happened with no issues after an 1,100 drive? Can this be a major issue?

Thanks so much!

jamieo

Check it on the driver info screen and see what it says.Sounds like you may have a bad oil pressure sensor.Common problem on the C5 and C6.

Corvette_Ed

I have to agree. The oil pressure sensor is going south on you. Good news is it's not a hard fix, and one that you can do yourself if you have any mechanical skills. Just make sure you get the brass sensor to replace the stock one, which you can get from your local O'Reilly's. These forums have plenty of do-it-yourself videos on how to fix it. I fixed the one on my C5 (same as the C6) using a coat hanger.

SixAddict

Jeff T.

Now you're officially in the club!

Good Luck getting it sorted!

87SAM

Is this a manual or an auto tranny?

DougandBeth

Manual

PAULEB07

I agree with the others!

Not that this is any revalents to your issue but, where did you pick it up and where are you located? We need some pictures!!

wayback

Oil pressure sensor failure is pretty common as they approach 10 years.
The sensor is located behind the intake plenum on the drivers side. With small hands and some luck you can swap it out.

I removed the wipers, and windshield cowl then cut a hole in the fiberglass cowl support right above the sensor. You will need a special thin wall socket for the sensor, auto stores have them for around $5. Unplug the connector and swap the sensor then reconnect the plug. I used aluminum duct tape to cover the hole but that is not necessary as it can't be seen after the cowl is replaced.

Amazon has a heavy duty solid brass sensor at a good price (half what my local stores wanted).

Good luck.

arobber

That pressure sounds about right for a GS with a manual transmission. The dry sump systems display that kind of oil pressure when cold started. When warm, a normal 40+ PSI is correct. I would not worry about it.

86SC

this.

the dry sump oiling system is like that. mine is always 80psi when first started then down to about 40ish when at idle.

there is even a rev limiter in the PCM code for the dry sump if the oil temperature is not above a set amount

Thera p

Check to see if you have the dry dump oiling system. If you have the mn6 AND magnetic ride your car should have dry dump and it is designed to run at much higher oil pressure. 60-80 psi is normal when cold. Warm idle is approx 40 but will go much higher with increased rpm

Patsgarage

Mag ride has nothing to do with the dry sump, all MN6 GS coupes had the DS system.

Patsgarage

To the OP, if you do have the dry sump system the procedure for checking the oil level is different than normal. The oil must be up to operating temp (this can take a while with these cars) and then shut off the engine for ~5-10 minutes, then check the level.

CrvtBB

Oh Boy

My '13 GS with dry sump is exactly also like this. Any cold start almost pins the gauge. At warm idle is right around 30-35-40 depending on the temp.
This is warm idle:

This is halfway warm and it is still at 60psi:

Oh Boy

I have never seen my car when fully warm have a psi at 45-60

Spaceme1117

Completely normal as other have stated for the GS manual trans with dry sump.

My 2011 Grand Sport manual does the exact same thing. About 65 PSI right when I start it, and pegged out at 80 PSI until it reaches operating temp. Then at idle it reads about 35 to 40 PSI.

I would imagine is is a result of the dry sump engines having two oil pumps, one pushing and one pulling. But I look at this a being an excellent thing.

gsflyer2011

2nd above. Lot of oil to warm up, takes a long time for op to come down.

FAUEE

Obvious question, but your oil is warmed up right? Your oil pressure will be high with cold oil, and with the dry sump and immense cooling, it takes a lot to get the oil up to temps...

EDIT: The others beat me to it.