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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Losing tire pressure



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      06-30-2008, 10:59 AM   #1
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Losing tire pressure

At around 8k miles I began to notice my tires where getting cupped. I have non zsp 328i and running the bridgestone RFT. When I checked my tire pressures where around 28 PSi. I rotate and rebalance and now at 10k I check again and they are around 28 to 30PSI. Is this normal and why did'nt the TPM set off my light?
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      06-30-2008, 05:31 PM   #2
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Check your driver's side door. When you open it, on the left side of the driver's side seat, there should be some specifications. The recommended PSI with the stock wheels are there. I believe typically the TPMS goes off when the PSI is 5PSI or more too low.
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      06-30-2008, 05:44 PM   #3
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And all tires loose pressure over time. They also change with temp. You have to set pressure of tires when they are cold.
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      06-30-2008, 07:04 PM   #4
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Oh right, that is correct, thanks for adding that Nice one
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      06-30-2008, 07:42 PM   #5
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I know. I check them in the morning or after the car has been sitting all day and I go to leave the office. Thing is my Pathfinder's light will go off after 1 tire drops by a few pounds. The dealer said the TPMS wont be triggered if all the tires loose air slowly. Whats that about? I could be driving on a long trip and end up with 20PSI in my tires and I get no warning?
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      06-30-2008, 08:22 PM   #6
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i have nitrogen in my tires. the pressure stays constant longer and i get free refills from where i got it (olin mott tires)
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      06-30-2008, 08:42 PM   #7
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Does it ride smoother and less noisey?
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      06-30-2008, 11:05 PM   #8
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Quote:
Originally Posted by xpcgamer View Post
I know. I check them in the morning or after the car has been sitting all day and I go to leave the office. Thing is my Pathfinder's light will go off after 1 tire drops by a few pounds. The dealer said the TPMS wont be triggered if all the tires loose air slowly. Whats that about? I could be driving on a long trip and end up with 20PSI in my tires and I get no warning?
The warning goes off in case of differential in rotating speeds of tires, if all lose air at the same rate , the system cant analize which tire is rotating less
You must have slow leak or something, but first try to inflate the tires according to the scale and load on the car and see where that takes you
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      07-01-2008, 01:59 PM   #9
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Well that stinks? Why have a monitor TPM sensor in each wheel? If that was the case wouldn't it just use the ABS sensors? I'll keep an eye on 4. Damn tires seem to wear out pretty quick to. I am hoping they last me to 3/9 when the lease is up. I hope I dont run into this when I lease the next one!
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