Puncture or not?

[Garyhun]

After posting about my puncture this morning I notice my tyre seems to be holding a full inflation pressure of 36psi today.

Is it possible that the freezing temps of yesterday did something weird to the tyre so as to make just that one tyre lose 6psi? As it's warmer today things seem normal.

Is this wishful thinking on my behalf or is it possible for freezing temps to do this. My car won't fit in the garage of the place I am renting right now so it's on the driveway all the time and been covered in ice the last 2 days!

[Monkey boy UK]

After posting about my puncture this morning I notice my tyre seems to be holding a full inflation pressure of 36psi today.

Is it possible that the freezing temps of yesterday did something weird to the tyre so as to make just that one tyre lose 6psi? As it's warmer today things seem normal.

Is this wishful thinking on my behalf or is it possible for freezing temps to do this. My car won't fit in the garage of the place I am renting right now so it's on the driveway all the time and been covered in ice the last 2 days!

Gary, had you had a drink or two yesterday? Could explain this strange phenomenon

[Garyhun]

Gary, had you had a drink or two yesterday? Could explain this strange phenomenon

I almost wish I had. But in the morning I went out in the car and after about 3 mins I got a TPS warning. Checked all tyres and NSR was at 30. Pumped it up and about 2 hours later was at 30 again. Pumped it up and left overnight - this morning it's at 30 again. Pumped it up and now after a run it's over 36 due to heat and does not seem to be losing prssure - and it's warmer today!!

Go figure?

[Garyhun]

Well no mystery in the end. Quick trip to Tyreland and the culprit, a bloody screw, was located!!!

[KfabR8]

There's always the possibility that there's something in the tire that's finally embedded itself enough that it's sealed the tire.

I've seen this with roofing screws. Had one go 15K in a truck. Never lost a spot of air, yet the screw was fully into the tire - at least 2.5" of the thing were sticking inside. I was not a happy camper when the tire store said "Hey, we fixed that screw in the tire for you, here's the bill." I'd told them specifically, to leave that one there, as the truck was in for another leaking tire, not the "screwed" one.

P1V1=P2V1 P=pressure, V=volume.

If the TPS was right at that limit of telling you that the tires were low before it cooled off, the change in temp was more than able to drop the pressure in the tires. Also, if you happened to have a high pressure weather zone around you at the same time, that would cause it. High pressure, drop in temp - that all equals less tire pressure.

What sort of gauge are you using? If it's one of those little spring resisted pencil style that has the piece that pops out the end and shows you pressure on it, there's a chance it's sticking slightly. Try a different gauge. That might explain the 30 psi, 30 psi and then 36 reading. The gauge was sticking around 30 and until you got past it's stick point, it was reading incorrectly.

Just thoughts.

[Garyhun]

There's always the possibility that there's something in the tire that's finally embedded itself enough that it's sealed the tire.

I've seen this with roofing screws. Had one go 15K in a truck. Never lost a spot of air, yet the screw was fully into the tire - at least 2.5" of the thing were sticking inside. I was not a happy camper when the tire store said "Hey, we fixed that screw in the tire for you, here's the bill." I'd told them specifically, to leave that one there, as the truck was in for another leaking tire, not the "screwed" one.

P1V1=P2V1 P=pressure, V=volume.

If the TPS was right at that limit of telling you that the tires were low before it cooled off, the change in temp was more than able to drop the pressure in the tires. Also, if you happened to have a high pressure weather zone around you at the same time, that would cause it. High pressure, drop in temp - that all equals less tire pressure.

What sort of gauge are you using? If it's one of those little spring resisted pencil style that has the piece that pops out the end and shows you pressure on it, there's a chance it's sticking slightly. Try a different gauge. That might explain the 30 psi, 30 psi and then 36 reading. The gauge was sticking around 30 and until you got past it's stick point, it was reading incorrectly.

Just thoughts.

I've got a quality dial gauge and all other tyres were OK! As I said it was a screw and it had gone deep and plugged the hole which is why after 3 losses of pressures it finally held.