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Old 12/07/2005, 04:26 PM   #1 (permalink)
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Tire keeps going flat

Hey everyone,

My front, passenger side tire keeps going flat on me. First time it was flat was about a month or so ago. I took it to a tire place and had them check for any slow leaks but they didn't find anything. I left my car at my house over Thanksgiving break (about 5 days) and came back to find the same tire had gone flat again after sitting in the cold garage. Last night the same thing happened. Went to bed with the tire looking good, woke up and found that it had gone flat.

I've heard that changing temperatures, especially cold, can cause a lot of fluxuation in tire pressure, but how much is normal? It was down to about 1 degree last night here, would that have caused it to drop that much overnight? Should I take it back to another place to get it checked out again? I just don't understand how it can hold pressure for a week or so, and then overnight lose it all.

Any suggestions?
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Old 12/07/2005, 04:35 PM   #2 (permalink)
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Have you checked the valve stem core? Make sure it is screwed in all the way. That is the piece that is inside the valve stem (the piece you push on if you want to deflate the tire). Your tire shop should have checked it when they checked for leaks, but many over look it.

Valve Stem Cores:


Valve Stem Tool (You need this to tighen/loosen it):
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Old 12/07/2005, 06:07 PM   #3 (permalink)
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If its not the core itself, then its the rubber valve stem piece that the core screws into.

I had a similar problem a while back. Mine would go flat as soon as I got on the freeway. It was the rubber stem.
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Old 12/07/2005, 06:48 PM   #4 (permalink)
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Perhaps it could be a valve stem extension? Valve stem extensions are quite simply pieces of crap. Also, the cold temperature would not cause the tire to fluxuate that much.
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Old 12/07/2005, 07:05 PM   #5 (permalink)
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it could also be a bead leak. have a place break it down, rotate the tire 180 degrees on the wheel and clean the bead on the wheel and tire, then reinstall and rebalance.
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Old 12/07/2005, 08:07 PM   #6 (permalink)
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Thanks guys. I'll just take it in tomorrow and make sure they give it a good check. After all, I have to at least be able to make it home for x-mas break on the tire.
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