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      10-15-2012, 11:02 AM   #1
Bob Santorini
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Very slow puncture..

Hi all

The TPM detected a pressure drop in one of my tyres a while ago.
Having manually pressure tested all tyres I found that the rear nearside was slightly down.
Since then I've been losing around 4psi per week and I took it to a tyre fitter a few weeks back but unfortunately they couldn't detect any puncture and stated that I should just keep an eye on it. So I upped the pressure back to 34PSi to match the other one and left it be.
Three weeks later (yesterday) I carried out a check and found it to be down to 22PSi. I'm amazed that the car still felt ok to drive whilst being so low on pressure! I couldn't feel much difference in handling.

So where do I go from here? I have about half tread-life remaining and a puncture which cannot be detected.
Not the end of the world and I'm sure it won't blow-out but I'm keeping the speeds down just in case.

I'm not bothering with re-setting the pressure monitor at the moment as enevitably it beeps within a few days to tell me what I already know..

Any ideas?

Thanks

Bob

Last edited by Bob Santorini; 10-16-2012 at 04:42 PM.
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      10-15-2012, 11:05 AM   #2
Marco@McKennaPerformance
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Did a shop tell you the puncture can't be detected or was that just looking for it?

I'd say take it to a locally recommended tire shop and let them dismount it to find the puncture and hopefully plug it.
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      10-15-2012, 01:16 PM   #3
Fsarc
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Make sure your valve stem/TPMS is tight. You could be losing air from there.
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      10-15-2012, 05:00 PM   #4
Bob Santorini
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The tyre shop took the wheel off the car and did a thorough check but failed to find anything. They slowly rotated the wheel whilst spraying liquid across the surface - I guess to see if any bubbles came through... They also checked the valve and it appeared to be ok.
This tyre shop has a good reputation..

I think I'll try somewhere else but ask them to remove the tyre if they can't find anything from the outside as it may be easier to detect from inside..

Or maybe over time it'll get worse enough for them to find the problem.

Bob
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