Once in a while, my tire suddenly goes flat

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Muse

Lifer
Jul 11, 2001
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My Mazda 1997 LX626 has its original tires:

Firestone P195/65R14 88S

The spare isn't full size. The car is little used - it has less than
16,000 miles on it. I keep plastic valve stem caps screwed onto my valve
stems.

I took a trip around 3 years ago, about 700 miles round trip, and an odd
thing happened. I'd checked all the tires before the trip and made sure
the pressure was OK. I wasn't aware of any kind of problems with any of
the tires. A day or two AFTER the trip, I noticed that the right rear
tire had gone almost flat. I pumped up the tire and kept an eye on it
but it stayed fully inflated and never seemed to be a problem until
about a week ago, when I noticed it was completely flat. That's no
problems for 3 years, when it happened again! I pumped it up to 27.5 lb.
A couple of days later, I had to use the car and checked the pressure
and it was still 27.5 (I have a digital guage). I drove the car around
20 miles and the next morning, it was flat! I pumped it up and haven't
checked it since, but it looks full.

What should I do with this? I wouldn't trust it now. Most of the little
driving I do is on the highway, and it's obviously a dangerous
situation. The tread is still good on all 4 of the tires. Should I have
a tube put in that tire, have it reseated, have the valve checked
replaced or something else, or should I get a new tire or a full set of
new tires? If the last, I guess I'd get Michelin's at Costco.

I saw a news story a few weeks ago where they said that tire
manufacturers are going to start recommending replacing tires after 7
years regardless of signs of wear. There have been some accidents and
they think that tires can't be considered safe no matter what they look
like if they are over 7 years old. Is this partly hype or should I just
bite the bullet and buy all new tires?

Thanks for any information.
 

labgeek

Platinum Member
Jan 20, 2002
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Have them look for a nail or similar in the tire. I had one that wouldn't go flat unless it was sitting at a certain point (tire to ground) when parked and then would slowly leak.

Assuming they find one... No tubes. No plugs. Have them patch it from the inside and rebalance.
 

sixone

Lifer
May 3, 2004
25,030
5
61
Why take the risk? Buy new tires. And put a surveillance camera on your car, someone's letting the air out for you.

 

Kremlar

Golden Member
Oct 10, 1999
1,426
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Also check for a possibly bent rim - sometimes a bend can cause a slow leak, or leak if the tire is sitting a certain way.
 

puffpio

Golden Member
Dec 21, 1999
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Yeah just take it to a tire shop and gave them look for leaks

Probably a nail in a tire causing a slow leak in only certain conditions

I would also pump up your tires to around 35 psi all around...

Standard tires have very soft sidewalls in the first place and using that low of a cold pressure would make them even floppier and unresponsive
 

Muse

Lifer
Jul 11, 2001
39,959
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Originally posted by: MikeyIs4Dcats
damaged rim causing a slow leak...or a damaged valve stem

The rim looks good, just looking at it from the side. Can they check the valve stem? I'm thinking now of jacking the car up and removing the wheel and inspecting for a nail or something. The recommended pressures on this car are 32 front, 26 rear (this is right rear).
 

scorpmatt

Diamond Member
Feb 8, 2001
7,040
97
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Originally posted by: Muse
Originally posted by: MikeyIs4Dcats
damaged rim causing a slow leak...or a damaged valve stem

The rim looks good, just looking at it from the side. Can they check the valve stem? I'm thinking now of jacking the car up and removing the wheel and inspecting for a nail or something. The recommended pressures on this car are 32 front, 26 rear (this is right rear).

once the tire is off the rim, they should be able to tell you whats wrong. take it to a shop, most will do it for free, especially if they think you are buying tires from them
 
Nov 5, 2001
18,366
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you may hve damage to the rim you can't se with the tire mounted. At any rate, like others said, a tire shop can look it over for you
 

Muse

Lifer
Jul 11, 2001
39,959
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I brought the car to Big-O and they didn't find a puncture. They evidently decided it was the valve, or so I was told. I asked if they'd replaced the valve and the answer was "yes." I got that not from the guy who did the work, but the manager, so I don't know for sure.
 

scorpmatt

Diamond Member
Feb 8, 2001
7,040
97
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Originally posted by: Muse
I brought the car to Big-O and they didn't find a puncture. They evidently decided it was the valve, or so I was told. I asked if they'd replaced the valve and the answer was "yes." I got that not from the guy who did the work, but the manager, so I don't know for sure.

let us know in 3 days or so
 

Muse

Lifer
Jul 11, 2001
39,959
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Originally posted by: scorpmatt
Originally posted by: Muse
I brought the car to Big-O and they didn't find a puncture. They evidently decided it was the valve, or so I was told. I asked if they'd replaced the valve and the answer was "yes." I got that not from the guy who did the work, but the manager, so I don't know for sure.

let us know in 3 days or so

Funny thing is even that won't be conclusive. The car went about 3 years without the problem cropping up again. It could be that the valve stem caught occasionally after being pumped, due to friction, dirt, whatever. If they did replace the valve, that should have solved it. I'll keep an eye on it. I've gotten in the habit of checking my tire pressures frequently, anyway. I often don't use the car for weeks at a time. It's not much trouble to check the pressures.
 

thomsbrain

Lifer
Dec 4, 2001
18,148
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have you pissed off your neighbors recently? cause letting the air out of someone's tires would be my first act of Neighbor War if I got that pissed.
 

Muse

Lifer
Jul 11, 2001
39,959
9,638
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Originally posted by: Landroval
Originally posted by: Muse
Originally posted by: Landroval
Angry ex-girlfriend

Huh? I guess that's what you are.


Gee, that was witty :roll:

I'm not trying to be witty. When I'm witty, I'm witty. Honestly, nobody would mess with my tires. You're messing with me. Thankfully, you don't know where I live.
 

Landroval

Platinum Member
Feb 5, 2005
2,275
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Originally posted by: Muse
Originally posted by: Landroval
Originally posted by: Muse
Originally posted by: Landroval
Angry ex-girlfriend

Huh? I guess that's what you are.


Gee, that was witty :roll:

I'm not trying to be witty. When I'm witty, I'm witty. Honestly, nobody would mess with my tires. You're messing with me. Thankfully, you don't know where I live.

It was a plausible suggestion, even if it was not correct. To suggest I would do such a thing or would want to stalk to do it to you is ridiculous.
 

Muse

Lifer
Jul 11, 2001
39,959
9,638
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Originally posted by: thomsbrain
have you pissed off your neighbors recently? cause letting the air out of someone's tires would be my first act of Neighbor War if I got that pissed.

Nope. It doesn't add up anyway. Read the OP and it's totally obvious. It happened 3 years ago, again 10 days ago, same tire. My neighbors don't have bad feelings about me. I had a leak, end of story.
 

montanafan

Diamond Member
Nov 7, 1999
3,551
2
71
Muse, I'd like to hear if replacing the valve solves the problem. I've had a similar problem with one of the tires on my Toyota Tacoma. I noticed the tire was almost flat one day, I pumped it up, about 3 weeks later it was almost flat again. I took it to a mechanic and he checked everything tire, rim, valve and couldn't find a leak. Pumped it up and it was fine for about a month then went flat again. I took it to a different mechanic, same results. A couple of months later, flat again. I haven't had it back to a shop, but I keep an eye on it and it now seems to be losing only about 3-4 lbs. a month.
 

Zenmervolt

Elite member
Oct 22, 2000
24,514
34
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Originally posted by: pio!pio!
Yeah just take it to a tire shop and gave them look for leaks

Probably a nail in a tire causing a slow leak in only certain conditions

I would also pump up your tires to around 35 psi all around...

Standard tires have very soft sidewalls in the first place and using that low of a cold pressure would make them even floppier and unresponsive
Bull.

Go with the recommended pressures for the car unless you are consistently maxing out the load capacity, in which case I would recommend an extra 5 PSI over stock IF the maximum inflation pressure on the tire's sidewall can handle the additional pressure.

Simply over-inflating the tires will lead to strange wear patterns.

ZV
 
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