Acceptable PSI loss?

scoss

scoss

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I thought I had a slow puncture on the front left side. Got it checked out and they said it was a faulty valve. I paid £20 to fix this. My issue is I’m still loosing around 2/3 PSI every week. Anyone else had an annoying issue like this? I know tyres do loose pressure over time but this isn’t right.

Any advice?

Could the hot weather be a factor?
 
scoss said:
I thought I had a slow puncture on the front left side. Got it checked out and they said it was a faulty valve. I paid £20 to fix this. My issue is I’m still loosing around 2/3 PSI every week. Anyone else had an annoying issue like this? I know tyres do loose pressure over time but this isn’t right.

Any advice?

Could the hot weather be a factor?
Click to expand...

My opinion is your loosing to much air-pressure for that small-time-frame.

Terry
 
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tigerhonaker said:
My opinion is your loosing to much air-pressure for that small-time-frame.

Terry
Click to expand...

Exactly! Garage said there were no nails etc in the tyre though. I might go back to get them to double check. Don’t really want to shell out another 20 as that half way to tyre.
 
You could have a bent alloy. Corrosion on the bead seat. Have you had any big pothole excursions?
 
2/3 PSI a week is far too quick for it to be normal. I don't check my tyres nearly often enough but even after a month or driving my PSI has barely changed.

Could be a slow puncture or something else, far from an expert but that loss is definitely not normal.

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The way I see it there are only 3 ways to lose air pressure from a tyre - 1. puncture, 2. valve, and 3. the seal between the rim and the tyre.
A couple of months ago one of the tyres on my dads car was doing just like yours and consistently losing a few pounds over a week. We examined the tyre for any obvious signs of a puncture and also made sure the valve was tight. All seemed fine so he took it to a local fast fit company and asked them to check for a puncture, but they couldn't find anything. They suggested resealing the tyre on the rim to see if that would cure it, and sure enough it did the trick. :)
 
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You should never have a loss of air pressure. You should check if they patched the tire correctly or if the rim is bent.

Sent from my Pixel 3 XL using Tapatalk
 
Leevr said:
You could have a bent alloy. Corrosion on the bead seat. Have you had any big pothole excursions?
Click to expand...

I curbed my alloy a few months back but I got it refurbed. I wasn’t a massive collision with the curb either. I was going quite slow.
 
rcnacura said:
You should never have a loss of air pressure. You should check if they patched the tire correctly or if the rim is bent.

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Click to expand...


Do most garages check if the rim is bent?
 
Ron240 said:
The way I see it there are only 3 ways to lose air pressure from a tyre - 1. puncture, 2. valve, and 3. the seal between the rim and the tyre.
A couple of months ago one of the tyres on my dads car was doing just like yours and consistently losing a few pounds over a week. We examined the tyre for any obvious signs of a puncture and also made sure the valve was tight. All seemed fine so he took it to a local fast fit company and asked them to check for a puncture, but they couldn't find anything. They suggested resealing the tyre on the rim to see if that would cure it, and sure enough it did the trick. :)
Click to expand...


I assumed that they would of resealed the tyre when checking for punctures and having to change the valve.
 
Most likely corrosion around the rim if they have checked the valve and looked for punctures. Only cure is refurb. Some tyre places use a liquid rubber and put it around the wheel for a better seal on corroded rims but it doesn’t last long, maybe 6-12 month.
I reckon mine is losing 1-2 psi every 2 months. I probably lose more air checking the pressure than it’s losing itself but I check mine like every 2-3 weeks.
 
Go back and get the tyres swapped on the same axle with a proper reseal. Will show up any faults with the tyre or alloy.
 
scoss said:
Do most garages check if the rim is bent?
Click to expand...
Not all the time. Hopefully there is some guarantee on their work and they can figure out since you've already changed the tire I believe

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rcnacura said:
Not all the time. Hopefully there is some guarantee on their work and they can figure out since you've already changed the tire I believe

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Click to expand...

Same tyre (only 3 months old) they fitted a new valve.
 
scoss said:
Same tyre (only 3 months old) they fitted a new valve.
Click to expand...
Then the valve could of been installed incorrectly or not tightented enough at the internal valve stem, which is causing the slow leak. Just go back to them and they should sort it out for you.

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rcnacura said:
You should never have a loss of air pressure. You should check if they patched the tire correctly or if the rim is bent.

Sent from my Pixel 3 XL using Tapatalk
Click to expand...

That is not a true statement.....you will have a loss of pressure over time and temperature is another factor, you will lose 1 psi with each 10F decrease change and gain 1 psi as it increases 10F temperature. The moral of the story is check your tyre pressure every 2 weeks on cold tyres, even tyres sitting in the sun will give you an incorrect air pressure. Check in your garage or on an overcast day, if the car sits outside.
Tyre valves are very easy to check, take the cap off, put a bit of spit on the open valve opening, if it starts to bubble, you have a faulty valve.
 
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Have you got a Costco near you? They use Nitrogen rather than compressed air, as it retains tyre pressure better....worth a try before going the more expensive route.

Flying Scotsman said:
Tyre valves are very easy to check, take the cap off, put a bit of spit on the open valve opening, if it starts to bubble, you have a faulty valve.
Click to expand...
Showing your age there! Old school bike trick :) Bet you put a playing card attached with a peg on your spokes as well didn't you? :p
 
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Air already contains just over 78% Nitrogen as it is..
 
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S32B said:
Have you got a Costco near you? They use Nitrogen rather than compressed air, as it retains tyre pressure better....
Click to expand...

Nitrogen in its purest form is more stable and doesn’t change much to heat so it’s better if you use it to fill a tyre.
it only works if it’s pure nitrogen inside the tyres. If there’s a bit of other gases from the normal air mix then it can be less stable than just using normal air.
There was hundreds of YouTube videos about this ages ago when it was hyped up especially when the Nissan GT-R was launched with nitrogen filled tyres from the factory. Even some kwik fits was selling it if I remember right and they put a green cap on the tyre valve to show it was nitrogen.
Will have a dig around and see if I can find the video with the tests that was done.
 

Here’s one of the videos I found. It’s quite an old one
 
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QUOTE Showing your age there! Old school bike trick :) Bet you put a playing card attached with a peg on your spokes as well didn't you? :p[/QUOTE]

You hit the nail on the head on both counts.....Guilty, as charged :blink: and that kid spirit is still alive :respekt:
 
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I had the same problem with my old Tiguan. In the end I over inflated the tyre to about 48psi, and made a large concentrated spray bottle of fairy liquid up. Took the wheel off and sat staring at various points for an hour till I spotted a bubble, a tiny hairline crack on the alloy.
 
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AlS3BE said:
Nitrogen in its purest form is more stable and doesn’t change much to heat so it’s better if you use it to fill a tyre.
it only works if it’s pure nitrogen inside the tyres. If there’s a bit of other gases from the normal air mix then it can be less stable than just using normal air.
There was hundreds of YouTube videos about this ages ago when it was hyped up especially when the Nissan GT-R was launched with nitrogen filled tyres from the factory. Even some kwik fits was selling it if I remember right and they put a green cap on the tyre valve to show it was nitrogen.
Will have a dig around and see if I can find the video with the tests that was done.
Click to expand...
Can testify to this, the mrs wheels haven’t budged a .1 psi in over 3yrs.
 
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Marky79 said:
Can testify to this, the mrs wheels haven’t budged a .1 psi in over 3yrs.
Click to expand...

Have you checked your air pressure gauge......that statement is very hard to believe. My 2017 S3 tyres were filled with nitrogen during the PDI prior to my pick up and lost pressure at almost the same rate as just plain air, around 1 psi every 3 weeks with no ambient temperature change at time of measurement.
 
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Wheels can become porous too, i had it with a 2004 Audi TT had to powdercoat the wheels to resolve. Castings are porous by nature of their structure
 
You'll know if the wheel is buckled when they put it on the balancer and spin it.

My advice (I'm a tyre guy) ask a decent tyre place to use bead sealer. That's most likely your issue.

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