Tire Pressure Monitors Hate Cold Weather!

[Penguin]

> The TPM does not measure absolute pressure. It is only capable of measuring relative pressure; ie. if your tire has lost a significant amount of air.


So what does it take as the baseline for the relative pressure measurement, the pressure in the tire at the time of a system reset?

[HaroldC]

Originally Posted by Penguin

So what does it take as the baseline for the relative pressure measurement, the pressure in the tire at the time of a system reset?

Yes, which why you need to set it.

[jpl]

here in Montreal its been -25 to -30 celcius, and no pressure warning

BTW I repaired one of my ROF Dunlop 18-inches, in the country...service would have never found me, could not use the phone, so I had a 7$ kit,
and after lots of highway at reasonnable speed its still hold, no pressure warning either

so, yes , ROF can be repaired, this is actually the second time, on 2 diff. tires

[HaroldC]

Originally Posted by jpl

BTW I repaired one of my ROF Dunlop 18-inches, in the country...service would have never found me, could not use the phone, so I had a 7$ kit,
and after lots of highway at reasonnable speed its still hold, no pressure warning either

so, yes , ROF can be repaired, this is actually the second time, on 2 diff. tires

Me too. The RF's for some reason are prone to nails. Or it's just me, when I drive the X5.

I actually have both rears plugged. Got a nail/screw in each one. Dealership obviously said to replace the tires, but at $400 each, it's just not worth it. Nothing wrong with plugged tires, and I have ~10k on one of them.

[JCL]

I have no problem with a plugged tire, and repaired a runflat on the Z4 that way.

However, I would not rely on a plug that was applied from the outside. It is a risky repair. The approved method for repairing a runflat (and the safe way to repair a non RFT) is from the inside. The plugs look like a mushroom, and combine a plug with an inside patch.

My tire dealer had the manufacturer's instructions for my specific tire, I think they were Bridgestone. Different rules from each RFT manufacturer, so YMMV.

[Bimmer4125]

I have had no trouble with the X5 tire pressure sensor in this round of bone chilling weather. Our Hummer H3 does have sensor issues - the sevice guy says it is cold related and that the overall tire pressure in the tire fluctuates when weather changes hot to cold. I did change out the X5 Summer Air for Winter Air in the fall - don't know if this helped.

[mwares212]

This morning I witnessed the first TPM warning. It was -10 degrees this morning so I understand the issue. When there is a 40 degree drop in temperature, I would expect the system to notice a problem. I checked all the tires and all except the driver front was within 1 psi. I am glad the system worked though!

[Ag4.8]

I got the warning today. Got upset at first, then realized I had "four flat tires" Reset it and checked the tire pressures at home. 30 in front and 34 in back. A "freezing" 29 here today. I had my warning go off a few times in my 4.8is. Once I actually had a nail in the tire!