1. Join Now

    AVForums.com uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Tyre pressure query, please help!

Discussion in 'Motoring' started by Miyazaki, Sep 3, 2005.

  1. Miyazaki

    Miyazaki
    Well-known Member

    Joined:
    Sep 10, 2003
    Messages:
    14,304
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    136
    Ratings:
    +849
    I have tubeless tyres on my alloy wheels, and I understand that this combination leads to a loss in tyre pressure.

    However, I get a great disparity between wheels. All tyres are pumped up to 32psi, on a given week the tyres end up like this though:

    Front left tyre : 30 psi
    Rear left tyre: 8-12 psi
    Front right tyre: 24 psi
    Rear right tyre: 24 psi

    I am scratching my head as to why this always happens.

    99% of the time it is just me driving the car, no passengers, no heavy goods on the passenger seat or anything like that.

    If it helps it is a honda civic 1.4i

    Thanks
     
  2. Mylo

    Mylo
    Well-known Member

    Joined:
    Mar 13, 2003
    Messages:
    5,541
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    106
    Ratings:
    +372
    Sounds like your valves are a bit knackered. Try checking for air leaks round the valves using some water.
     
  3. Ian J

    Ian J
    Banned

    Joined:
    Aug 6, 2001
    Messages:
    25,529
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    166
    Ratings:
    +4,906
    To look at it in a different light the two right hand tyres are losing 20% of their air pressure which will lead to poor handling and shortened tyre life. The rear left has a serious problem which is either a faulty valve or a slow puncture but it's dangerous and needs to be sorted urgently.

    Don't forget that tyre pressures should be read when the tyres are cold
     
  4. Miyazaki

    Miyazaki
    Well-known Member

    Joined:
    Sep 10, 2003
    Messages:
    14,304
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    136
    Ratings:
    +849
    I'll have a look at the valves and if there is a puncture on the rear left tyre. I just wanted to check if it might be anything else. Could it possibly be a sharp edge on the alloy itself?

    Thanks.
     
  5. Mylo

    Mylo
    Well-known Member

    Joined:
    Mar 13, 2003
    Messages:
    5,541
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    106
    Ratings:
    +372
    The inner edge of an alloy wheel is radiused so that shouldn't be possible. Another possibilty is that the alloys could be buckled. In extreme cases the tyre bead wont sit right on the wheel and will leak air.
     
  6. Londondecca

    Londondecca
    Active Member

    Joined:
    Dec 21, 2003
    Messages:
    2,080
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    66
    Ratings:
    +96
    Most decent garages will test for free. I recently had two rear punctures, it cost about £10 to get them fixed.
     
  7. John8

    John8
    Standard Member

    Joined:
    Jul 20, 2005
    Messages:
    6
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    1
    Ratings:
    +0
    If the alloys are laquered then a layer of corrosion can form between the laquer and the rim due to the exessive use of salt during the winter. Some wheel cleaners can also cause corrosion if there is a defect in the laquer for the liquid to get under. This can cause a loss of pressure because of a poor seal at the bead. Removing the tyre, cleaning off the white powder with a wire brush and re-fitting with sealing compound on the bead will cure the gradual loss of pressure.
    I had this problem some years ago with an MG Meastro, the laquer was lifting on all wheels and the corrosion had crept behind the bead of the tyre. When the worn tyres were removed there was a lot of powdery deposit around the rim where the tyre seals.
     
  8. ODB_69

    ODB_69
    Distinguished Member

    Joined:
    Feb 8, 2008
    Messages:
    12,154
    Products Owned:
    0
    Products Wanted:
    1
    Trophy Points:
    166
    Location:
    Englishman in Scotland
    Ratings:
    +2,299
    Hate to bump such an old thread but a google search led me back here.

    I have an issue with my rear tyre losing pressure, been to 2 garages to fix this and its still going on. Originally it was going from 2.2-1.7 bar over a 4-6 week period, since they've messed with it I've gone from 2.4 (when they'd just 'fixed' it) to 1.5 over night. 1st Garage did the beading 2nd garage did the lacquer.

    Waiting on original garage (dealership) to ring me back but 2nd garage (who are usually pretty good but have been wrong a couple of times) say its the wheel itself that will need replacing then as the alloy must be damaged

    anyone got any ideas? I'm starting to panic cause I have a 300 mile journey with the family on Friday to go on and I dont want to risk it
     
  9. FZR400RRSP

    FZR400RRSP
    Banned

    Joined:
    Mar 5, 2007
    Messages:
    31,980
    Products Owned:
    1
    Products Wanted:
    0
    Trophy Points:
    166
    Location:
    Aberdeen
    Ratings:
    +10,437
    If all obvious points of a leak have been exhausted (tyre/valve/bead), then the only other thing I've heard of are the wheels themselves becoming porous.
    In which case, replacement is the only option.
    Or maybe the wheel is cracked?
    BMW m-sport wheels were notorious for that, but not sure if air loss was a symptom.
     
    Last edited: Jun 18, 2012
  10. ODB_69

    ODB_69
    Distinguished Member

    Joined:
    Feb 8, 2008
    Messages:
    12,154
    Products Owned:
    0
    Products Wanted:
    1
    Trophy Points:
    166
    Location:
    Englishman in Scotland
    Ratings:
    +2,299
    Dont think the Valve has been checked as yet. Dealership are going to take it in Wednesday and have a proper look. They assumed it was bead as that was the most common problem apparently. I'm still worried though in case its whole wheel. 20" Dodge alloys I'm guessing aint gonna be cheap but tbh as long as its safe for the family I dont care on price, I just want it sorted!
     
    Last edited: Jun 18, 2012
  11. FZR400RRSP

    FZR400RRSP
    Banned

    Joined:
    Mar 5, 2007
    Messages:
    31,980
    Products Owned:
    1
    Products Wanted:
    0
    Trophy Points:
    166
    Location:
    Aberdeen
    Ratings:
    +10,437
    Valve hasn't been checked?
    That's baffling, it's one of the first places to look, and the easiest fixed.
     
  12. ODB_69

    ODB_69
    Distinguished Member

    Joined:
    Feb 8, 2008
    Messages:
    12,154
    Products Owned:
    0
    Products Wanted:
    1
    Trophy Points:
    166
    Location:
    Englishman in Scotland
    Ratings:
    +2,299
    Not as far as I know. Certainly wasnt by the 1st garage and the 2nd made no mention of it whatsoever, only baout the lacquer which they said was quite bad so they cleaned it up
     
  13. FZR400RRSP

    FZR400RRSP
    Banned

    Joined:
    Mar 5, 2007
    Messages:
    31,980
    Products Owned:
    1
    Products Wanted:
    0
    Trophy Points:
    166
    Location:
    Aberdeen
    Ratings:
    +10,437
    In order, I'd expect air loss checks to be

    1-valve
    2-puncture
    3-wheel issues
     
  14. ODB_69

    ODB_69
    Distinguished Member

    Joined:
    Feb 8, 2008
    Messages:
    12,154
    Products Owned:
    0
    Products Wanted:
    1
    Trophy Points:
    166
    Location:
    Englishman in Scotland
    Ratings:
    +2,299
    Juts rung 2nd garage, they say they did check them. Hmm...surely it would take longer than 10 mins to check all this?
     
    Last edited: Jun 18, 2012
  15. ODB_69

    ODB_69
    Distinguished Member

    Joined:
    Feb 8, 2008
    Messages:
    12,154
    Products Owned:
    0
    Products Wanted:
    1
    Trophy Points:
    166
    Location:
    Englishman in Scotland
    Ratings:
    +2,299
    Surely a puncture would fully deflate though within 48 hours? not a little here and as little there. Especially as originally it was a 4-6 week period for a around 0.5 loss?
     
  16. FZR400RRSP

    FZR400RRSP
    Banned

    Joined:
    Mar 5, 2007
    Messages:
    31,980
    Products Owned:
    1
    Products Wanted:
    0
    Trophy Points:
    166
    Location:
    Aberdeen
    Ratings:
    +10,437
    Not all punctures are fast.
    If its a nail, it can stick in the tyre and effectively seal itself again.
    But some air can be lost around the nail through tyre movement etc
    Not being cheeky, but haven't you heard of 'slow punctures'?
     
  17. ODB_69

    ODB_69
    Distinguished Member

    Joined:
    Feb 8, 2008
    Messages:
    12,154
    Products Owned:
    0
    Products Wanted:
    1
    Trophy Points:
    166
    Location:
    Englishman in Scotland
    Ratings:
    +2,299
    Yeah but not that slow
     
  18. FZR400RRSP

    FZR400RRSP
    Banned

    Joined:
    Mar 5, 2007
    Messages:
    31,980
    Products Owned:
    1
    Products Wanted:
    0
    Trophy Points:
    166
    Location:
    Aberdeen
    Ratings:
    +10,437
    I'm confused.
    I thought it was 0.5 bar over 4-6 weeks, but then it suddenly went to 1.5 bar overnight?
     
  19. ODB_69

    ODB_69
    Distinguished Member

    Joined:
    Feb 8, 2008
    Messages:
    12,154
    Products Owned:
    0
    Products Wanted:
    1
    Trophy Points:
    166
    Location:
    Englishman in Scotland
    Ratings:
    +2,299
    Yeah 0.5 loss over 4-6 weeks, then 0.7 overnight loss but only after they fiddled with it
     
  20. DVD-Man

    DVD-Man
    Well-known Member

    Joined:
    Jul 24, 2004
    Messages:
    8,567
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    136
    Location:
    Ayrshire, Scotland
    Ratings:
    +1,926
    Are the alloys badly corroded?
     
  21. ODB_69

    ODB_69
    Distinguished Member

    Joined:
    Feb 8, 2008
    Messages:
    12,154
    Products Owned:
    0
    Products Wanted:
    1
    Trophy Points:
    166
    Location:
    Englishman in Scotland
    Ratings:
    +2,299
    Nope
     
  22. GGTVBD

    GGTVBD
    Well-known Member

    Joined:
    Feb 5, 2004
    Messages:
    3,365
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    106
    Location:
    Bradford, West Yorkshire.
    Ratings:
    +323
    Powder coating the wheels would eliminate pressure being lost through a porous alloy.
     
  23. ODB_69

    ODB_69
    Distinguished Member

    Joined:
    Feb 8, 2008
    Messages:
    12,154
    Products Owned:
    0
    Products Wanted:
    1
    Trophy Points:
    166
    Location:
    Englishman in Scotland
    Ratings:
    +2,299
    I'll ask them about this thanks
     
  24. DVD-Man

    DVD-Man
    Well-known Member

    Joined:
    Jul 24, 2004
    Messages:
    8,567
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    136
    Location:
    Ayrshire, Scotland
    Ratings:
    +1,926
    That's the route I was going to go down, the mrs had problems with slowly deflating tyres and a full refurb was the solution after scrubbing the inside of the rims and also using some liquid sealant that a tyre place suggested.
     
  25. ODB_69

    ODB_69
    Distinguished Member

    Joined:
    Feb 8, 2008
    Messages:
    12,154
    Products Owned:
    0
    Products Wanted:
    1
    Trophy Points:
    166
    Location:
    Englishman in Scotland
    Ratings:
    +2,299
    Would it be possible to drive on a 245 when the other tyres are 265? Just in case they can't fix in time for holiday. Everything else on the tyres are the same except the width on the spare
     

Share This Page

Loading...