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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 11-30-2010, 12:34 PM
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Vanos4:12PM Vanos4:12PM is offline
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All 4 tire low pressure warning

So the day after thanksgiving it went from 76 degree's on Turkey day to 27 degree's Friday morning. Later that day (Friday) I started it up to go home and received a low tire pressure warning on the display that appeared that all four tires were low. (not sure if it was indicating all 4 tires because this is the first time I have seen this icon appear)

I assumed with the great drop in temp in such a short period of time caused this. Has anyone else experienced this? Needless to say, I pumped them up to all the correct PSI 32/35 at a gas station and reset the warning. In typical German engineering, I have heard the tire pressure monitoring system is very sensitive and just the slightest decrease in tire pressure will trigger the alert?
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  #2  
Old 11-30-2010, 12:42 PM
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E92Submarine E92Submarine is offline
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Quote:
Originally Posted by Vanos4:12PM View Post
So the day after thanksgiving it went from 76 degree's on Turkey day to 27 degree's Friday morning. Later that day (Friday) I started it up to go home and received a low tire pressure warning on the display that appeared that all four tires were low. (not sure if it was indicating all 4 tires because this is the first time I have seen this icon appear)

I assumed with the great drop in temp in such a short period of time caused this. Has anyone else experienced this? Needless to say, I pumped them up to all the correct PSI 32/35 at a gas station and reset the warning. In typical German engineering, I have heard the tire pressure monitoring system is very sensitive and just the slightest decrease in tire pressure will trigger the alert?
That's a big temperature drop. Not surprising at all.

Pressure = (nRT/V)

Everything on the right side of the equation stays constant except for T (Temperature). So from 76 to 27 degrees, that's about a 9% drop in absolute temperature and thus about a 9% drop in pressure. I guess it could cause all 4 sensors to go off if you were a little low in the first place.

It's been a few years since I've done any real math, so go easy if I fudged that up.
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Last edited by E92Submarine; 11-30-2010 at 12:49 PM.
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  #3  
Old 11-30-2010, 12:44 PM
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Emission Emission is offline
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Quote:
Originally Posted by Vanos4:12PM View Post
I assumed with the great drop in temp in such a short period of time caused this.
Bingo.

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  #4  
Old 11-30-2010, 12:47 PM
energetik9 energetik9 is offline
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There is some allowance for change. I thought it was in the 10-15% range, but I have no basis for that. I have experienced something similar, but in one tire. As you mentioned, a big temperature variation and when I got back in the car, the warning went off. I went to the closest gas station and it was only a few pounds low.

My wife's Acura is very temperamental. Hers seems to go off often whenever the temperature changes. Drives her crazy....
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  #5  
Old 11-30-2010, 12:48 PM
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There is thread somewhere that goes into great technical detail as to how the sensors work, when they are triggered, etc. If you can find it, all your questions (and even some questions you didn't consider) about the TPMS will be answered.
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  #6  
Old 11-30-2010, 02:10 PM
jmh328 jmh328 is offline
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Quote:
Originally Posted by Vanos4:12PM View Post
So the day after thanksgiving it went from 76 degree's on Turkey day to 27 degree's Friday morning. Later that day (Friday) I started it up to go home and received a low tire pressure warning on the display that appeared that all four tires were low. (not sure if it was indicating all 4 tires because this is the first time I have seen this icon appear)

I assumed with the great drop in temp in such a short period of time caused this. Has anyone else experienced this? Needless to say, I pumped them up to all the correct PSI 32/35 at a gas station and reset the warning. In typical German engineering, I have heard the tire pressure monitoring system is very sensitive and just the slightest decrease in tire pressure will trigger the alert?
On the morning of Nov.1st I got the low pressure warning on my Honda (just a few days before I was to pick up my BMW). The Honda does not indicate which tire(s) is low. It was 7 am and dark outside....too dark to check the pressure. Thought that maybe people were messing with the car on Halloween night. I remembered that my tire place opened at 7 am and drove the car there. They checked the pressure and found that all were low. It was the first really cold morning here and he inflated all the tires to spec. Problem solved.
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  #7  
Old 11-30-2010, 02:54 PM
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And don't forget that tires lose pressure slowly on their own anyway. The OP's tires were probably already low when the temperature change kicked in.

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  #8  
Old 11-30-2010, 03:03 PM
Tom K. Tom K. is offline
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IIRC, the earlier thread on TPMS indicated two things: One, newer models and those with software upgrades will indicate which tire is low as opposed to the generic low pressure icon. And two, the low pressure warning apparently kicks in when approx. 20~25% of the pressure has been lost.

The one time I saw it, the pressure had gone from 35 down to 28 lbs.. Refilling the tire without resetting the system worked fine and the light has stayed off for the past 4,000 miles.

But tires should be checked manually at least monthly - especially as temps are dropping in many areas.

Tom
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  #9  
Old 11-30-2010, 05:27 PM
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Inline Sixer Inline Sixer is offline
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Yup similar thing happened to my E93 -- but never in the X5 (bigger tire?). I got a low warning for my left front tire only, but my handheld digital gauge read 27 across ALL tires. I never understood why the TPM would pick out one tire.


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