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Multiple tires losing pressure fast
I have been dealing with problems with my tires losing pressure very fast for a long time (years). I'll fill them up to 32 PSI as directed, but within sometimes as short as a few days to a couple weeks, the drivers front will be down to 18-22 PSI, and the passenger front will be down to 22-25 PSI. The rear tires drain more slowly...maybe down to 27 PSI or so. The pattern stays constant even after tire rotations -- a tire that was holding to a 3-5 loss on the back will jump to the 10-14 PSI loss when it's rotated to the front drivers side, for example, and a tire that was draining fast on the front will start draining slower on the back.
The tires are Cooper CS4, 215/50R17, 91V rating. The local tire chain I've been using suggested them for my car years ago. I did notice just now when researching that the specs in the manual are for a 93V rating. Not sure if that makes a difference. I'm about 200lbs, and I carry passengers fairly rarely - maybe 1 or 2 people on the weekends, or occasionally 1-3 at lunch. I do load a guitar amp rig of 90 lbs into the trunk weekly.
The tire shop has tested the tires and says it's normal for alloy wheels to lose pressure like this. I just don't believe that. Yes, it does happen particularly fast (often 1-2 days) when the temperature is colder. And yes, it does go from an attached garage out to the cold weather every day, so there is a bit of a temp shock. But even during the summer, it will drop down much faster than I expect. I don't think losing 40% of your tire pressure in less than a month is ever normal, is it?
What should I do? It's driving me nuts. Taking it to another shop is certainly an option, but this type of issue is supposed to be covered by the warranty from the shop that sold me the tires, and I'm suspicious they're telling me it's normal just to get out of doing work.
Last edited by bkrodgers; 12-12-2010 at 04:31 PM.