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Losing tire pressure

 
Old 07-17-2017, 11:46 PM
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Losing tire pressure

my wife's 2014 RLX loosing tire pressure... There is no damage to the tires or any nails. It happens often when the temp drops outside. I understand that the low profile tires don't hold as much air as the regular ones but the pressure drops from 240 psi to 190 and the low pressure alarm goes off...
Have anybody else expirienced this problem?
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Old 07-18-2017, 08:05 AM
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No issue on the my '16. Tire damage is sometimes hard to see with the naked eye. It doesn't take much for a slow leak to occur. You may have run over something you are not aware of. Could also be a loose/worn valve stem. Might want to have it looked at.
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justnspace (07-18-2017)
Old 07-18-2017, 08:08 AM
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It's a common occurrence, when temperatures drop, air pressure drops.

Also might be leaking from valve stem or something punctured tire
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Old 07-18-2017, 08:12 AM
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Ideal gas law states when temp drops, so can pressure

Tire pressure should always be tested/filled up when cold. 240 refers to kPa (because canada) which is a tad under 35 PSI for us American folks. 190 kPa = 27.5 PSI. Fill up to 240 kPa when cold and keep watch.


That being said though, , but 20% drop is pretty steep so it may be a loose valve stem as mentioned above.. Take it to a tire place so they can check the entire tire.
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Old 07-18-2017, 10:37 AM
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I often see a similar drop in tire pressures during the winter months. We have a heated garage (which we keep at around 15C (59F) and outside temperatures below minus 30C (minus 22 F) are not unusual around here and that big a temperature drop will lead to a substantial drop in tire pressure. In the winter months, we add at least two or three psi (13 - 21 kPa) extra tire pressure so that the pressure does NOT drop too low if the car is outside in the cold for a few hours.

The key to discovering if you have a leak or not is to monitor if the tire pressure returns to normal when the car is in a warmer environment (garage for example). If it does, you are experiencing normal temperature related pressure fluctuations and simply keep your pressures higher than the door sticker recommendation during the winter months so the TPMS alarm is not triggered. If the pressure does not return to normal, get thee to an Acura dealer or tire shop and have it checked out - you have a slow leak.

Just my two cents.
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Old 07-18-2017, 02:41 PM
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Thank you guys, that's all makes sense. The drop of the temperature happened in a summer and not in a winter. I'm talking about from +30C to +17C. So most likely I have an issue with a slow leak - may be a valve. Off to go to the tire shop....
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Old 07-18-2017, 05:00 PM
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I have the same issue. When it gets hot and cold I lose about 5 psi of tire pressure on two of my wheels. I have cracks on the side wall so I think that would be my issue.
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Old 07-19-2017, 07:35 AM
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I was consistently using 1 lb per week; fill back up and still lose 1 lb/week, during the heat of spring/summer. I had a faulty TPMS that needed to be replaced.
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Old 07-19-2017, 07:49 AM
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Originally Posted by wilspainar View Post
I have the same issue. When it gets hot and cold I lose about 5 psi of tire pressure on two of my wheels. I have cracks on the side wall so I think that would be my issue.
yikes, dry rot is a whole separate issue
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Old 07-19-2017, 12:58 PM
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Originally Posted by justnspace View Post
yikes, dry rot is a whole separate issue
Yeah, driving around on dry/cracking tires is a no-no, especially at high speeds. That is a blowout waiting to happen!
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Old 07-19-2017, 11:00 PM
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Ok so I took the car to the shop. No problems with tires or valves at all.... They pumped up the pressure and told me to keep an eye on it. Will see what's gonna happen.
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Old 07-19-2017, 11:00 PM
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Ok so I took the car to the shop. No problems with tires or valves at all.... They pumped up the pressure and told me to keep an eye on it. Will see what's gonna happen.
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Old 07-20-2017, 06:17 AM
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let us know!
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Old 07-20-2017, 08:01 AM
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Originally Posted by Kgb2016 View Post
Ok so I took the car to the shop. No problems with tires or valves at all.... They pumped up the pressure and told me to keep an eye on it. Will see what's gonna happen.
Scratching my head on this one. Seems to me if the tire is repeatedly suffering a pressure loss, something is amiss. You have already put air in the tire and it seeped back out. To me, that is a problem. Maybe you just needed Acura air. Hopefully that was free!
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Old 07-20-2017, 12:06 PM
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My other option is to feel the tires with nitrogen. It doesn't expand/contract as much as regular air. That would be my next step.
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Old 07-20-2017, 12:21 PM
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^the atmosphere is 78% nitrogen. in essence, it wont do anything
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Old 07-20-2017, 12:22 PM
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I can't win...���� lol...
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Old 07-20-2017, 12:37 PM
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are all 4 tires, losing air?
or is it just one?

I would go to a different tire shop to have them inspect and figure it out.
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Old 07-20-2017, 12:41 PM
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Yes all 4. That's what makes it weird. If it's only one - then it's definitely a nail or some other thing.
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Old 07-20-2017, 05:25 PM
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If all four tires are inflated to the recommended pressures and a drop from 30 degrees to 17 degrees causes the TMPS to be triggered, then there is a problem with the TPMS system. My guess is that your wife's tires were a "bit low" to begin with (but not low enough to trigger the TPMS) and then the drop in temperature was enough to drop the pressure below the threshold for the TPMS warning. Fortunately the TPMS system did its job and warned your wife to top up the pressures before they were low enough to do damage to the tires or become dangerous to drive on.

My old man advice is to click over to the TMPS in the MID at least once a month and check the pressures in your tires. If they are even a bit below the recommended level, top them up. That way you are always at the optimum inflation for the best handling and safest driving.

Just my two cents.
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Old 07-06-2019, 08:50 PM
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I had one tire going low, it was the tpms sensor. Sprayed some soapy water and could see bubbles.

At the BMW UDE, the instructor had the tire pressure screen up, probably the most useful screen of all of the options. He even aired down some tires during the session. Now I check the pressures daily.
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Old 07-11-2019, 11:06 PM
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Acura is currently investigating this issue.

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Old 07-14-2019, 12:37 PM
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I was adding air weekly on the 14, but it was out of warranty, one of the reasons for the trade. Now with the 16, I can go a few weeks, but one tire is losing air.
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Old 07-14-2019, 07:57 PM
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I have had to replace all 4 TPMS sensors and valves when I replaced my latest set of tires. Unexpected $1000 cost.
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