First problem with my Jeep..

I have a stock 2009 with only 1500 miles on it and a few days ago the temps dropped below 30* and the tpms alert came on. I initially assumed it was just the sensors but the tires were all a bit low so yesterday I filled them all up to 35psi cold and went to work. After about 7 hours I went home (it was 12* outside) and all tires had lost air..

Cold reading FL=25psi FR=34psi RL=34psi RR=28psi.

I have not heard of this before and I do not plan on filling my tires every day and not a fan of leaving my monster with the dealer$hip so any one with advise or experince please chime in.

My concern would be why did the FL and RR lose so much air. Rim leak or faulty suensors. Tires will lose about 1 pind of air for every 10 degree Temp drop.

Your pressure could actually be lower if you measured the air pressure as soon as you got home and the tires were warm. You may have to have a tire shop look at them. Could be a rim leak, valve problem, or faulty sensors. Also, have you checked that you don't have a screw of nail in the tire even though they are RFT's?

First problem with my Jeep..

I have a stock 2009 with only 1500 miles on it and a few days ago the temps dropped below 30* and the tpms alert came on. I initially assumed it was just the sensors but the tires were all a bit low so yesterday I filled them all up to 35psi cold and went to work. After about 7 hours I went home (it was 12* outside) and all tires had lost air..

Cold reading FL=25psi FR=34psi RL=34psi RR=28psi.

I have not heard of this before and I do not plan on filling my tires every day and not a fan of leaving my monster with the dealer so any one with advise or experince please chime in.

Assuming the wheels are checked and there are no cracked rims, or tire punctures... You may do well with a nitrogen fill. (about $10/tire or $30 for 4). I had thought it was snake oil until I started reading up on it and went to the web site. (nitrofilldotcom is one who does it at my Jeep dealer. They actually had a coupon for a free N2 fill. ) The nitrofill is devoid of any water vapor, it will be a more stable pressure over varying temps, the N2 molecules are 'bigger' and less likely to escape from the tire and supposedly you hold pressure longer. Bottom line is it will pay back itself in tire wear improvement and you won't be topping off the tires. (Yes you'd need to go to the dealer... but likely only once a year.) I did this fill a few months ago, and have seen zero pressure change when the tires are cold. (of course my cold temp is 80deg). But should help in the winter climates also.

First problem with my Jeep..

I have a stock 2009 with only 1500 miles on it and a few days ago the temps dropped below 30* and the tpms alert came on. I initially assumed it was just the sensors but the tires were all a bit low so yesterday I filled them all up to 35psi cold and went to work. After about 7 hours I went home (it was 12* outside) and all tires had lost air..

Cold reading FL=25psi FR=34psi RL=34psi RR=28psi.

I have not heard of this before and I do not plan on filling my tires every day and not a fan of leaving my monster with the dealer so any one with advise or experince please chime in.

Mine does the same thing here in Chicago when it gets below 30 F. Just noticed that the other day as well.

Same thing happens with my 09 Maxima.

Although it definitely looks like you are loosing air in 2 of the tires, the other two are not an issue, as that is simply cold temperatures causing that air in the tires to becomes 'more dense' which takes up less room, and therefore has less pressure in the tire. You arent actually losing air in 2 of the tires, they simply are seeing their 'air' molucules slow down, and take up less space due to the cold temps. As soon as you start putting some heat in the tire (by driving it, or getting it in sunlight) those tire temps increase, and so does your tire pressure.

I get this every winter in the srt8, and it always complains and Hannah always tells me about the warning, and i tell her not to worry about it, if they are all 28-29 and above. (you're 25 would bug me, it seems you might have a leak). To appease her, I will add a pound or two to each tire. But I generally dont like to over inflate those tires, because they are 'hard enough' (ride comfort) due to the run-flat sidewalls.

I'd suggest perhaps filling up all four to 35 psi , and confirm its the case on the onboard computer and your own personal tire pressure guage and see if they dont all drop to 34/33 when cold out and then hold steady. (even going back up under normal driving) IF they do that, then your fine, if 2 keep loosing air, then you def have a problem.

Jon

That happend to me every day the temps fall below freezing ,when I still had run flats on it wasnt so bad i drove to the nearest quickcheck and used there tire filling station ,but it became a real p i a when i switched away from the run flats having to hook up my compressor every day. I've tried the nitrogen thing and it helped a little but after a couple of days pressure would be low and had to fill again with normal air . Only thing thats worked for me is to get the tire sealed on. not sure what the name of the stuff they used was but they lay a bead of it around the tire where it meets the rim. Put the stuff on before last winter and have not had a problem since.

Tried this again today and it was about 10* warmer.. aired up all tires to 36 psi cold. In the Jeep the FR reported 33psi so I could have been off a bit on filling that one.

Tonight when I left the evic report cold readings of FL=29 FR=35 RL=34 RR=27


Last time starting at 36 psi Cold reading FL=25psi FR=34psi RL=34psi RR=28psi.

Noticing a pattern here and while I forgot most of what I learned in physics classes I would think if it was a valve the problem would not just be in colder weather correct? For three months the pressure never changed even when the temps went from 80 to 30's but as soon as we went below 30* they started leaking.

Seeing other post here and from what I found with Google it is not uncommon for this to happen with the RSA's. I am thinking that they are going to come off real soon!!

Also for those of you that asked the tires only have 1500 miles on them and were visually inspected for any damage. Tire pressure was measured using my old trusty dial gauge and not just the dash even though that seems to be spot on with the true pressure.

Check the TPMS sensor bolt to make sure it's tight as well. I had a loose TPMS bolt LR tire that was loosing pressure ever so slowly, exacerbated by the temp in the AM. It was loose enough to warrant extra turns with the ratchet. No pressure issues since.

I went with the nitrogen fill and it worked for me. It has
been at least 3 months. Now all tires stay right around 33.

I had the same thing and it aggrevated the crap out of me. I went ahead and did the Nitrogen fill and haven't had a problem since. Before doing that, try this. The tag on the door frame says 33psi cold and the sidewalls say the same. If you dont have a pump at home, its hard to get an accurate "cold" reading by the time you get to the gas station. Naturally, your tires will gain about 3-4psi when they get warm so what I did was fill them up to about 36-37psi while warm so when they did get "cold", they would be around 33psi. Sounds corny but it worked. Anywho, here is where you can find your local nitrogen place if you want to go ahead and do that.
http://www.getnitrogen.org/
Go to the bottom center where it says NITROGEN DEALER LOCATOR and type in your zip.

i live in chicago and also have noticed that the temperature changes messes with the air. my back left is low at 28psi. never have mine dropped down to 24 tho so i dunno. Right now my tires are at 28, 30, 30, 30

LOL its funny but as im reading this My jeeps at the tire shop getting a ton of the black tar stuff they use to keep air seeping out of the rims put in..I went from 38lbs last night to 5 and 10 lbs when i got up today...now its real real cold here like -30 so what is going on is if your running the stock rim its SOOOOO smoth and the tires are lower profile and when they get to cold its like glass on glass...the rims shrink and the tires shrink then they blead air....what you need to do is have your tire guy put some of the tar like crap around the bead of the tire...that SHOULD keep it from leaking air...

I went with the nitrogen fill and it worked for me. It has
been at least 3 months. Now all tires stay right around 33.

That's funny you should say that. My TPMS went off this morning and I have nitrogen too. The temp was -6C. Same thing happened last year about this time. It's just physics. Took it in and had them filled. I don't buy into the nitrogen theory though except for maybe less moisture and only got that $169 option for the tire warranty it comes with.

Bernie

LOL I can see now im going to be the cold weather testing guy :D

http://www.theweathernetwork.com/index.php?product=weather&placecode=CANT0032&switchto=f&switchto=c

Fellas,

I agree with Rambit...it's just physics (or chemistry). The monitors are correct in reading a lower pressure in cold weather. I'm gonna reach back to my college chemistry and pull the geek outta me:

pv=nrt

Sound familiar? pressure x volume = volume of gas x gas constant x temperature. As temperature goes up, the pressure of a gas goes up as well. It happens with all gasses, whether or not its nitrogen or not. So as temperature drops, the pressure does as well...

So during cold months, you gotta fill up your tires with 'extra' air to maintain the same pressure. Happens to me every year as well...

I think it's something about Boyle's Law or Charles Law or some other law I never understood and probably broke...haha.

Bernie

When its extremely cold out like today, does anyone else have the service tire pressure monitoring system light come on?

When its extremely cold out like today, does anyone else have the service tire pressure monitoring system light come on?

Mine are on for the rear tires. ill eventually put some more air in, but i dont worry about it too much, as long as it doesnt drop to somethin like 25psi i wont rush it....just gets annoying

Ok guys heres the deal...it looks like I get the coldest weather where im at so far..(-40)..and I woke up to day and 3 of my tires were down to 3psi from 36psi....turns out the problem is the TPS and the valve...it looks like once it gets below - 20 they shrink real bad....I had my tire guy swap out the TPS and put in an old school valve...so far no leaks...I will keep you posted....so if your bleading air once you top them up when it gets cold then look to your TPS...Our Rims hate the cold....

When its extremely cold out like today, does anyone else have the service tire pressure monitoring system light come on?

Whats Extremely cold where you are :D

I am having the same problem here in Chicago, drivers rear reading 25, filled to 33, waited, took a reading with a gauge and still 33, but sensor is still showing 25 on the dash???

You may do well with a nitrogen fill. (about $10/tire or $30 for 4). I had thought it was snake oil until I started reading up on it and went to the web site. (nitrofilldotcom is one who does it at my Jeep dealer. They actually had a coupon for a free N2 fill. ) The nitrofill is devoid of any water vapor, it will be a more stable pressure over varying temps, the N2 molecules are 'bigger' and less likely to escape from the tire and supposedly you hold pressure longer.

Ordinary air have 80% of nitrogen, 18% of oxygen and 2% of CO2, so called pure nitrogen can be at most of of 97% of purity. Do you think that 17% increase really matters and worth 10 bucks?
By the way - the size of nitrogen molecule is 0,32 nm, size of oxygen molecule is 0,30 nm, CO2 molecule is even bigger - 0,33 nm

It's better to park a car so that valve stems on each wheel are in upright (12 o'clock) position in that case they are less prone for leakage. The heavier nitrogen molecules will concentrate in bottom side of the wheel and won't escape through the valve stem. :-)

Outside temp this morning 9 degrees. Right rear 26 and warning came on. I don't look forward to filling my tires up all winter long. This thread has been very enlightening.

YKPizzaGuy, it's absolutely balmy here compared to you. Yikes

First problem with my Jeep..

I have a stock 2009 with only 1500 miles on it and a few days ago the temps dropped below 30* and the tpms alert came on. I initially assumed it was just the sensors but the tires were all a bit low so yesterday I filled them all up to 35psi cold and went to work. After about 7 hours I went home (it was 12* outside) and all tires had lost air..

Cold reading FL=25psi FR=34psi RL=34psi RR=28psi.

I have not heard of this before and I do not plan on filling my tires every day and not a fan of leaving my monster with the dealer so any one with advise or experince please chime in.

had the same problem with mine when first got it,but only on front 2

turned out both alloys had cracks in them so both replaced under warranty

same problem with my 07 in ab canada. anything below -25c the tires loose pressure fast even go right flat. (even tho they are run flats lol) once it warms up they hold right around 33-34psi. Also below -25c the tpms doesnt operate correctly and the light stays on.

Ok, so I went to the dealer today and he filled it back up with nitrogen...There seems to be a rash of these happening going on with the big wheels. He said if it still looses pressure in a few days come back and they will be glad to replace the wheel and tire...See, that is how it should happen. So far so good....

had the same problem with mine when first got it,but only on front 2

turned out both alloys had cracks in them so both replaced under warranty

I have the same problem 3 our 4 will go down in below 0 weather. In normal winter they never lost air.

cold air contracts which causes less pressure. the same amount of air is in the tire, its just the particles are closer together. when you drive for a little you may notice that the pressure will increase, this is caused because the tires are warming up which causes the air to warm up

cold air contracts which causes less pressure. the same amount of air is in the tire, its just the particles are closer together. when you drive for a little you may notice that the pressure will increase, this is caused because the tires are warming up which causes the air to warm up

I agree with that and the pressure may change as much as 3 to 5 psi with 50 degree change of temp. but these would go to 0 psi when the temp would go below 0 and stay that way for 24 hours. Micro cracks in the wheels. When the temp. goes down the metal shrinks cracks open up air leaks out.

I had slow leaks in two tires (lost 1 or 2 psi per day) when the cold weather started here in central PA. Took the Jeep to my GoodYear dealer but they could not find a problem, so they just remounted the tires. Problem persisted, so I want back. This time they found that the wheel balancing weights (on the inside rim, where you can't see them) were pressing on the tire bead, causing the slow leak. They changed to a new type weight, and so far no problems.