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Hot!Slow loss of tyre pressure.

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C4 MRC
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C4 MRC PCGB Member
2020/09/04 10:49:23 (permalink)

Slow loss of tyre pressure.

I recently purchased a 2011 997 GTS from a good independent, due to surgery the car was delivered by low loader and kept in my garage for a few weeks. I noticed that both rear tyres, recently replaced P-Zeros, were down to c. 16PSI. Since this time I have taken the car out for one decent run to warm the tyres through and have monitored what now seems to be a loss per day of .5 PSI. The dealer has been great and states that if not a puncture (checked its not) this is covered under the warranty. To get this sorted I am going to have to take the car to a local specialist but before I do so does anyone have experience of a similar issue? 

Mike Carter

6 Replies

STiG911
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Re: Slow loss of tyre pressure. 2020/09/04 11:02:15 (permalink)
Given that it's happening to both sides at more or less the same rate, I'd say the tyres aren't sealed on the rim properly. They'll need to be reseated.
AndrewCS
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Re: Slow loss of tyre pressure. 2020/09/04 15:24:24 (permalink)
" loss per day of      .5 PSI."
 
Is this …  5psi or 0.5 psi ? 
 
 
 
 

Aberdeenshire (R2) : Cayman GT4 981


Lancerlot
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Re: Slow loss of tyre pressure. 2020/09/04 19:09:54 (permalink)
Easiest way to identify an air leak is the remove the wheel and immerse it a bath full of water.
The most likely reason is leakage from the tyre valve i.e. a defective or loose valve core. Remove the dust cap and put some spit over the valve opening to check for bubbles. A less common and  often overlooked reason is a porous wheel rim.
Regards,
 
Clive

The older I get - the faster I was!
Past - 924T, '911 SC, 911 C, 911 C2, 964, 996, 996TT, 997TT, 997GT2, 430 Scuderia, 997TT, 997TTS, 991.2TTS. Macan SD. Raleigh bike!
C4 MRC
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Re: Slow loss of tyre pressure. 2020/09/05 08:24:33 (permalink)
Thanks all, some good tips the 'porous wheel rim' is the expensive one, so off to the independent whilst under warranty! 

Mike Carter
MDW
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Re: Slow loss of tyre pressure. 2020/09/24 16:36:59 (permalink)
I've just bought a 997.1 turbo and am experiencing a similar thing. The passenger side rear wheel loses 0.2/3 bar over a couple of days,  and no more. It's very strange. The dealer is going to resolve, as they'd just fitted 4 new michelins.
Human12
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Human12 Guest of the Club
Re: Slow loss of tyre pressure. 2020/10/19 21:45:04 (permalink)
I have a similar problem, went to tyre fitters they checked for puncture by immersing wheel in water bath, found air leaking around valve stem seal, have purchased new stem £6 eBay just need to return for them to fit. 
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