<meta name="GENERATOR" content="OpenOffice.org 2.3 (Unix)"> <style type="text/css"> <!-- @page { size: 8.5in 11in; margin: 0.79in } P { margin-bottom: 0.08in } --> </style> We just got our first winter day here (8 degrees Fahrenheit). When I drove the super duty the low tire pressure warning came on after ten miles. When I checked the tires' pressures all four were 12-15 psi low. Is that a normal amount of pressure to lose just due to cold weather? I find it hard to believe that all four tires have a slow leak or somebody lowered the pressure on all four wheels, etc. But I wouldn't expect the factory system to trigger due to normal weather conditions. Either way I just spent ten minuets freezing my back end off filling the tires to get the low pressure system to shut up.

 

That depends...when was the last time you checked your tire pressure? Seems to me...that what you experienced...is normal, if you haven't check tire pressure in some time. Especially...since they were all about the same low pressure.

Keep an eye on them for the next few weeks...


biz

 

Not unusual. For every 10 degree drop, you can expect 1-2 PSI drop. More if the tire is bigger like a truck tire.

The density of air expands and contract with the temperature. Aircraft tires use nitrogen for this and other reasons to maintain stable tire pressure.

My four cars at the house experienced this recently when our first winter temp drop hit us.

Hootbro

 

Well I've actually never checked the pressure in my tires. The truck is two months old (900 miles). So it looks like the factory did a half-a$$ed job filling the tires. That combined with the cold weather dropped the pressure enought to trigger the low pressure sensors.

 

Shame on you! Gotta keep track of that stuff! Anytime I buy/test drive anything I make sure I check all the "vitals" tire pressure included.

 

Very common. My wife's Murano has TPMS, on real cold days you sometimes get a low tire alert. Her tires run at 33 PSI, when you get down to 10F the tires can easily lose 9 PSI.

 

Yeah, this happens all the time, especially if the vehicle sits quite a bit. Doesn't matter if it's a truck, 4 wheeler, or a dirt bike. And I second what UP_There said, always check tire pressure, especially when buying a new or new to you rig! When I bought my 00 Yamaha YZ 426F dirt bike new in April of 00, I couldn't figure out for the life of me why the thing felt like it was riding on solid ice everywhere I went. After 3-4 rides I checked the tire pressure- 30 PSI in each tire, max is supposed to be 12! Plus, keeping your tires properly inflated will help extend the life of your tires, and with the price of a tire these days you can't afford to be wearing them out too quickly.

 

Lots of dealers do this. They run the tires low so test-drivers think it rides great.

 

Thanks for the input guys. When I bought the truck I went through the effort to put the pressure guage in the glove compartment but I didn't think to check the pressure. Now that I think about it, of corse I should have checked.