c4-toy

My left rear Pirelli PZero, which is less than a year old, seems to be losing air. It gets down to about 20lbs and no lower. I refill to 40lbs and in a few days of sitting in the garage goes back to 20lbs (never less). Had the dealer check for leaks and they find nothing. Any ideas would be welcome. Thx Joe B.
PS: Someone mentioned putting in some fix-a-flat from a can. Not sure i want to try this.

Ray Calvo

If dealer is having a problem finding a leak, then bering it into a tire shop. Ask around to see if people in your area know a reuptable one.

24FPS

fill tyre back up & put some spit /soapy water on the un-capped valve stem (as low as you can go)... bet 'ya got a valve that needs to be replaced esp. if it bleeds out & stops @ 20psi... the spit will show bubbles if there's a leak. cheap to fix @ a local shop. best of luck.

rich
'97 993 cab trpl blk
'00 986 trpl blk (w/ Pzero rosso's)

jason952

check the stem. if that's not it, jack up the car and spin the tire, looking carefully for nails. if you see one, spray paint right where it is so you don't forget.

Jason

David in Chicago

Also possible is surface corrosion in the bead seat area of your rim.

If the bead of the tire doesn't seat against a clean, smooth surface, the rim can allow air to leak out slowly through the seat/bead area. This type of leak is typically slow and hard to detect.

This type of corrosion can result from any damage to the finish on the rim in the bead seat area, which eventually corrodes outward from the area of the damage, causing the kind of white, chalky corrosion common to aluminum. This chalky mess keeps the bead of the tire from seating perfectly against the metal rim, allowing air to seep out.

The fix is either expensive (have the rim refinished) or cheap, but ugly (have your tire installer "paint" the bead seat with a tar-like coating made specifically for this purpose just before re-installing the tire - as I said, it's ugly but it works and it's not visible from outside).

Regards to all.

ZAMIRZ

Not sure if your wheels are chromed, but if so that may be causing the problem. Depending on how far your wheels were "dipped", the chrome that goes around the bead of the wheel may not be sealing properly with the tire. An easy way to fix this problem is to have the tires unmounted and the chrome sanded down where the tire makes its seal on the rims.

shuang

I had this exact problem when I first got my car, turned out that there was a hole in the rim (a casting flaw). The repair cost about CAD240 ~ USD170.

Temple

I once had a slow leak that was hard to locate -- gas station refilled my tire with air, took off my wheel and put it in a large bucket of water. Tell-tale bubbles showed exactly where the problem was...

Mike in O.C.

My right front tire did the same thing about a month ago. The tire shop could not find a leak, so just to be sure I had them replace the valve stem even though it was just 6 months old.
Problem solved.

AKA

don't use fix-a-flat!!!!!!!

c4-toy

Thaks to all for all the quick replies and feedback! I will post the result when i have all of the above checked.

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by AKA:
<strong>don't use fix-a-flat!!!!!!!</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">What is the negative issues with fix-flat?

Caveman

Hi Joe,

Also check if your wheels have had any cosmetic painitning round the rim as this can eventually become a bit porous and let air out.

Good luck!

Cheers,

David
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