Question about 2008 Toyota Sienna

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Tire slowly losing pressure over several days

2008 sienna ce:
tire slowly losing pressure over several days, no visible damage but a suspicious looking proprietary valve stem. could this be the source of my slow leak?

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I WILL BET THERE IS A NAIL OR SCREW IN THE TREAD SOMEWHERE AND U HAVE NOT SEEN IT BECAUSE IT IS GROUND OFF FROM THE ROAD. THAT IS THE PROBLEM JUST ABOUT 99% OF THE TIME, REALLY DOUBT THE VALVE STEM IS THE PROBLEM.

Posted on May 14, 2010

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Yes as well as the rim

mix some water and liquid dish soap
spray onto the valve stem and around the rim where it meets to tire and watch for bubbles

Posted on May 14, 2010

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My tires keep losing air pressure


Rosie, Tires loose air usually for the following reason, could have a small puncture, Tire may have deep weather/cure cracking,valve stem leaking, tire to rim seal(corroded or damaged), even big changes in temperature can change air pressure in a tire.
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Check the attached links,instruction and guides for more info., Good luck.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Why do my tires keep losing air
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http://www.city-data.com/forum/automotive/1545072-losing-air-pressure-one-tire.html

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Air can leak from the tire valve or the rim.

I would use soapy water to check the valve and valve stem for air leak.

It may be too small to detect.

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245-65-17 tires will save a little on your wallet.

2" decrease in diameter reduce the weight and rolling resistance.

The ride feel will be different.

Do a little checking with your local tire shop before you switch.

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