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      08-23-2012, 09:45 PM   #1
tiowen
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Loss of tire pressure

For the past months I've noticed that one of my tires (rear left) is significantly losing air pressure.

I always set my 2 front wheels on 200 kpa (29 psi) and the 2 rear wheels 230 (33 psi)

I usually check my tire pressure every 2 weeks and the tire on the rear left loses pressure the most from 33psi to 27psi. Unlike the other 3 tires that just loses around 1 to 2 psi.

Tires are still in good condition.

Have any of you guys experienced this?

Last edited by tiowen; 08-23-2012 at 10:45 PM.
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      08-24-2012, 01:58 AM   #2
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not really....although one time it says the tyre pressure is very low. When I check at the petrol station everything was spot on. I've read somewhere that on extreme weather condition it can happen. I remember that week was very cold & I park my car outside at work.
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      08-24-2012, 03:50 AM   #3
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Had the same problem, ended up getting the tyre re-fitted and the fitter put extra rim seal when re fitting , since then haven't had any issues
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      08-24-2012, 10:11 AM   #4
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Quote:
Originally Posted by tiowen View Post
For the past months I've noticed that one of my tires (rear left) is significantly losing air pressure.
Sounds like you have a slow leak.
Is it an RFT (run-flat)? If so, you may be able to repair it providing there's no damage to the sidewall.
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      08-24-2012, 05:04 PM   #5
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Is your rim cracked? Get the tyre shop to dunk the wheel into a water trough and look for a leak.
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      08-24-2012, 08:24 PM   #6
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Yeah it could be a cracked rim that is gradually letting the air out.
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      08-25-2012, 01:49 AM   #7
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Your air pressure is low. Especially the front. I'd recommend around 34 to 38PSI. There are many possibilities for where the air can leak. The most common is just your normal puncture / slow leak. A decent tyre shop should be able to sort it out.
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      08-25-2012, 03:48 AM   #8
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Quote:
Originally Posted by John_01
Your air pressure is low. Especially the front. I'd recommend around 34 to 38PSI. There are many possibilities for where the air can leak. The most common is just your normal puncture / slow leak. A decent tyre shop should be able to sort it out.
Mmm the sticker on my e92 says over 40??
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      08-25-2012, 06:17 AM   #9
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Mmm the sticker on my e92 says over 40??
That's probably for a full car with luggage for highway use (German autobahn). 19" wheels will normally spec a higher pressure too. On my 325 I found the shocks didn't seem to have enough damping if using more than about 36PSI in the front, but that would depend a lot on the car and the tyre size.
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      08-25-2012, 05:27 PM   #10
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I had the same issue few days ago. I toke my car out after a week of it being parked, i got the tire pressure warning on the idrive just after 1km of driving & as usual i panicked. I still drove the car as i didn't see any visible loss of air in any of the tyres. Got them checked at the near gas station that was 5kms away & the rear left was only 10psi, i fill 32psi all around as i drive alone & the roads are terrible this side of the world. After that i drove back home & got the tyre checked today by a tyre specialist & there is no sign of a puncture. The tyre guy says could be the valve or some dirt got into it anyways its fine now but he recommended me to change my tyres as they done around 20k kms. Is that the tyre life for stock rfts?

Thanks..
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      08-26-2012, 07:48 AM   #11
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Originally Posted by insane79 View Post
The tyre guy says could be the valve or some dirt got into it anyways its fine now but he recommended me to change my tyres as they done around 20k kms. Is that the tyre life for stock rfts?

Thanks..
Should be able to get longer than 20k. Mine are still the original and I have done around 29k and still going ok.
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      08-26-2012, 10:56 AM   #12
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Quote:
Originally Posted by John_01 View Post
Your air pressure is low. Especially the front. I'd recommend around 34 to 38PSI. There are many possibilities for where the air can leak. The most common is just your normal puncture / slow leak. A decent tyre shop should be able to sort it out.
THIS! ^

I'm running oem 19s on my 335i e93. The door says 37 for the fronts and 41 for the rears but this spec is for no luggage and runflats for e93 335i M sport. If i had an e92 with 19s, id pump the rears as same as the fronts. Try 38 all round. Should be sweet and your tyres will wear out evenly and last longer.
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      08-26-2012, 11:01 AM   #13
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Had a pin-hole in mine. Did the same thing. Take it to your local tire shop and they should be able to find it and plug/patch it for like 20 bucks...mine was free because Im military
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      08-26-2012, 11:06 AM   #14
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Quote:
Originally Posted by insane79 View Post
I had the same issue few days ago. I toke my car out after a week of it being parked, i got the tire pressure warning on the idrive just after 1km of driving & as usual i panicked. I still drove the car as i didn't see any visible loss of air in any of the tyres. Got them checked at the near gas station that was 5kms away & the rear left was only 10psi, i fill 32psi all around as i drive alone & the roads are terrible this side of the world. After that i drove back home & got the tyre checked today by a tyre specialist & there is no sign of a puncture. The tyre guy says could be the valve or some dirt got into it anyways its fine now but he recommended me to change my tyres as they done around 20k kms. Is that the tyre life for stock rfts?

Thanks..
Sounds about right. Depends on your driving style. My latest set of rft's are on 16000 kms. Still has 35-40 percent tread left on them. They will do another 6-7000kms in my opinion but that's because I baby the car most of the time. Don't take off hard or slide around. I'm looking forward to changing them soon because I want to go for a spirited drive I'd say change em. Safety first if you are a heavy footer.
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      08-27-2012, 03:33 AM   #15
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Originally Posted by bcoz View Post
Sounds like you have a slow leak.
Is it an RFT (run-flat)? If so, you may be able to repair it providing there's no damage to the sidewall.
Yes my tires are RFTs. Are these common on Run flats?


Quote:
Originally Posted by John_01 View Post
Your air pressure is low. Especially the front. I'd recommend around 34 to 38PSI. There are many possibilities for where the air can leak. The most common is just your normal puncture / slow leak. A decent tyre shop should be able to sort it out.
I just follow recommended tire pressure on the door jamb. For a full car with no luggage, it says 29 psi front and 33 rear.
Im using 18" by the way.
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      08-27-2012, 06:32 AM   #16
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Quote:
Originally Posted by dr335e93
Is your rim cracked? Get the tyre shop to dunk the wheel into a water trough and look for a leak.
I haven't really get a chance to check it closely. Does a cracked rim require buying a new set of rims? Or is there a quick fix for this?
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      08-27-2012, 07:21 PM   #17
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You can get a cracked wheel welded. But it most likely will crack again either through the weld or on either side of it as the welded bit is stronger and creates a stress riser.
You can weld it and cross your fingers but with the experience I've had I would just buy a new wheel or change all four to a new style straight off the bat.
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      08-28-2012, 07:57 AM   #18
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Quote:
Originally Posted by tiowen View Post
Yes my tires are RFTs. Are these common on Run flats?
No, they are no more common than on conventional tyres. It's just that if the RFT sidewall is punctured/damaged in any way, the tyre cannot be repaired.

As others have suggested there could be other causes for the leak (including cracked rim). You should have it inspected at a tyre shop ASAP.
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