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10-21-2013, 10:13 AM | #23 | |
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10-21-2013, 02:11 PM | #24 |
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Drives: 2012 E82 6MT Sport
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You shouldn't have metal caps to begin with: There have been stories of metal valve caps seizing with the valve stems due to galvanic corrosion...
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10-31-2013, 04:57 PM | #26 |
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Any idea as to how many pounds of pressure that the tire is low before the warning comes on?!!
I used to check my tires regularly, but with the BMW sensor I wrongly ASSumed that after a deficit of a 2-3 lbs the sensor would kick in. I too recently had the warning go off on my front left tire. I checked it and it was 10lbs low...so was the left front!....both rears were down 5 lbs.... I have a portable compressor and will be checking regularly in the future...! Sounds like the BMW sensor system is a joke... |
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10-31-2013, 05:16 PM | #27 | |
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For example, I checked mine this past weekend, and after 5 weeks, each tire was down about 2-3 PSI when taken after the car had sat overnight and was about the same outside temperature. So, especially on our cars, check 'em, and check 'em often. |
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10-31-2013, 05:25 PM | #28 | ||
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I finally got tired of it, and took it to the dealer yesterday, and they said it's cause by the weather changes. I told her that this has been happening for a week now, and she said it's normal LOL. She claimed that everything is ok, and told me to come back if it happens again. This is really annoying especially it's going to be cold soon. I can't imagine myself putting air in every morning before I leave just to make sure it doesn't throw that warning. This TPMS sensor sucks, and it's a surprised why it only happens to one tire, which is the FRONT LEFT tire. Anyone else having the same issue? Quote:
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10-31-2013, 05:46 PM | #30 |
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A lot of it has to do with weather changes too since the temperature will have a big impact on the pressure readings. Warmer the temperature - higher the readings and vice versa. PSI readings will also go up as you drive and the tire and air in there warms up.
The rule of thumb is every 10 degree drop in temperature will lower your psi by 1 degree. So, take that into account as if the last time you reset it you filled it up and it was 90 degrees out in summer, and are checking when it's 35 degrees now in the morning, will be a huge difference. You'll see a bigger impact too if your car sits outside at night. You also might want to try having your tires filled with nitrogen, too as it's a more stable gas, bigger molecules, less crap in there, and will hold a set PSI much better. Problem is it's harder to do yourself at home. Signed, Mr. Wizard |
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10-31-2013, 05:57 PM | #31 | |
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10-31-2013, 06:05 PM | #32 | |
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Instead of a second set of TPMS sensors you could have your car coded to EU tpms specs. The EU cars use the car's ABS sensors to detect a deflated tire. the US system is better I think, but the EU system is less error prone. Once your car is coded to EU system you simply unplug the TPMS pc in the rr wheel well. Also very common is for the metal valve stem nuts(a 11mm nut) to loosen over time. They need very LOW torque. 4Nm(four!) I think. Cracked alloy wheels or damage tire sidewall damage is also very common. Everyone SHOULD be checking their tires every two or three fillups. But hardly anyone does that. Well... except over here were we have Autobahns were tire performance is important(!) and gas costs $9 per gallon! Then people check their tire pressures! Dack
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