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Author
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Topic: Tires losing pressure
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Rob Parsons
Gearhead Posts: 182
From: Lebanon,TN
Registered: Jan 2000
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posted 10-16-2002 08:28 AM
   
The tires on my friends 99 GT keeps losing pressure. The car sat two weeks and all four tires went flat. He took the car to a dealer and the cleaned the bead and wheel. That did not fix the problem. They are still slowly losing pressure. Has anyone had a problem with tires not sealing to the wheel?
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wythors
Gearhead Posts: 2693
From: The cold, gray Pacific Northwest
Registered: Sep 2000
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posted 10-16-2002 09:23 AM
The obvious thing to do is to take the car to a tire store and have the tire/wheel assemblies checked in a dunk tank. I've heard of one wheel on a car having an odd problem like a pinhole leak in the casting, a bad valve stem or not sealing at the bead. But all four? If this is a new occurance, I'd bet your friend drove through something that put a bunch of small holes in all four tires or somebody's messing with his valve stems.
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kcode
Gearhead Posts: 2559
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 10-16-2002 11:32 PM
Rob,
Have him check the valve core, make sure they are bottomed out in the stem. I kept losing air in two of the tires on my coupe, when Sears mounted the new tires on the TTD's rims they installed new stems and did not bottom the cores. Screwed the cores down and no more leaks.  Mike
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JoeC
Journeyman Posts: 91
From: Springfield, MA.
Registered: Jul 2000
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posted 10-17-2002 09:31 AM
If the tires are well worn, they can be more susceptible to punctures as opposed to when they are new, but I'd also be inclined to look in the direction of the valve stems. I've had new tires mounted in the past and have had to go back and have defective valves/valve stems replaced. If you can't see anything visible on the tread, and your friend already had the bead checked, the dunk tank is the best approach to pinpointing the real problem. Good luck.------------------
Joe C.
2000 V6 Convertible
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Rob Parsons
Gearhead Posts: 182
From: Lebanon,TN
Registered: Jan 2000
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posted 10-18-2002 08:16 AM
I will have him double check those things. I was going to suggest to him to spray soapy water on the valve stem and around the bead to try and figure out where the air is leaking. Thanks for the input.
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Boss302
Gearhead Posts: 841
From: Coleman, Wisconsin
Registered: Jan 2002
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posted 10-19-2002 10:03 AM
Soapy water works GREAT. Over the summer the right rear would always lose pressure. My dad sprayed soapy water over the rim and tire and we found out that there was corrosion(spelling?) on the valve and it wasn't sealing.
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