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Dec 9, 2008 | 10:11 AM

DP1940

Thread Starter

5th Gear

Joined: Sep 2008

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Run Flats

My tires constantly leak down, (all four at about the same rate) on my 08 C6. Is this a normal thing?

Dec 9, 2008 | 10:18 AM

2vettes

Le Mans Master

Joined: Apr 2005

Posts: 6,277

Likes: 72

From: Boston's south shore MA

No, it's not normal.

Dec 9, 2008 | 10:22 AM

AFVETTE

Team Owner

Joined: Sep 1999

Posts: 20,054

Likes: 44

From: Swansea IL

Quote:

Originally Posted by DP1940

My tires constantly leak down, (all four at about the same rate) on my 08 C6. Is this a normal thing?

I'd suggest you mix up some soapy water and apply it to the valve stems and look for bubbles. It could be that the nut that secures the valve stem (TPMS) is loose.

The other thought could be your car is now exposed to colder air temps (which lowers the PSI and could trigger a LOW TIRE message) causing your situation. In that event set your tire pressures to 30 PSI COLD. And I mean COLD, like early in the morning after the car has sat over night. In the winter I usually add a pound or two to be safe.

But for ALL FOUR Tires to exhibit the EXACT same lose is ODD to say the least. Good luck

Dec 9, 2008 | 10:29 AM

Daytona Bob

Race Director

Joined: Apr 2007

Posts: 13,007

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From: Happiness is Busch in Victory Lane!

St. Jude Donor '09 & '12, '14

It's cold weather

If there was a true leak - they would go flat eventually.

Dec 9, 2008 | 10:38 AM

xlr8rvette

Drifting

Joined: Mar 2005

Posts: 1,760

Likes: 69

From: Fayetteville Arkansas recently moved from Oakland Ca

St. Jude Donor '06

Had the same loss of pressure occur on my second set of tires. Did this for first 15k miles, then seemed to be ok. Third set seems okay, however, they are real sensitive to cold temperature changes.
Good luch

Dec 9, 2008 | 10:41 AM

JoesC5

Team Owner

Joined: Sep 1999

Posts: 41,732

Likes: 1,718

From: Springfield MO

You can expect the tire pressure to drop ~1 psi for each 10 degree temp drop. In the winter I fill my tires(on all my cars) about 3 psi over the mfg recommended pressure to allow for this and also because in the winter, the tire does not heat up as much during driving. Take your vette, that the factory recommends at 30 psi cold. On a warm/hot summer day, the pressure will go up to around 35 psi. the fasctory recommendation allows for this. In the winter it will only increase by around 2 psi(up to 32psi from the recommended 30 psi). So, I inflate my C6 tires to 33 psi cold, and when the get up to operating temp they are reading 35 psi. The same as in the summer.

Dec 9, 2008 | 10:46 AM

metal

Drifting

Joined: Sep 1999

Posts: 1,700

Likes: 15

From: Southern Florida

I have the same exact problem with my 08, less than 1000 miles. I am losing about 1# per week and will have to take my car in to see if this can be corrected.

Dec 9, 2008 | 10:50 AM

rjwoerheide

Drifting

Joined: Jul 2008

Posts: 1,576

Likes: 1

From: Webster Groves (St. Louis) MO

1,100 miles on my run flats and no leakage present. They were, however, low when the temperature dropped in November. I added air for the cold season and the pressure hasn't dropped since.

Good luck!