[kpzen]

Hi Santosh,

Seems like an improper tire install which has resulted in valve seal leak.

[EagleEye]

If it was a valve leak the tyres would be flat within a little while of running. If you say you can drive it for upto three days, it probably means that both your left tyres have punctures.
Drove the left side of your car off the road anytime?

[poloman]

I had the same problem recently in one of my Polo's rear tyres, losing around 1psi per day. The culprit was a perfect puncture. Two long nails had gone in, but almost vertically and sealing the puncture to some extent. This caused the air to leak very slowly but steadily.

[bblost]

For the purpose of testing do NOT swap just the front or rear tires.

Swap both or neither of them.

The worst case scenario in punctures is having a tire in the front and another diagonally opposite in the rear going bad at the same time.

[saket77]

Check if valves are not leaking air from their inlet points. Its a simple job by putting a drop pf water on the inlet. Presence of air bubbles will naturally tell that air is leaking from the valve. Else, it is possible that both tyres have punctures. You might have drove on a bed of thorns or nails on the left side, inadvertently.

[santoshr]

It was the valves. Took the car today to darshan tyres where I had got the alloy and the tired fitted. As soon as he dipped the tyre in water a steady stream of bubbles started rising up from the valve. It was the inlet which was leaking, new valves 100 bucks a piece resolved the issue. I asked him if we should change the valves on the right tires as well to which he suggested let them be, if U see a drop in pressure only then do it.

[rajivanoj]

it might be due to air hole, which is manufacturing defect of tyres, it is like pin hole, which is very hard to find , can be located with soap solution, i had this problem, where the air pressure dipped in a week time, in certain single wheel. then i found it. It was moulding defect

[prokinetic]

My car has mixed tyres of two different brands. Car is used only once a week. I have been observing since past few weeks that when kept parked, all the four tyres are steadily losing air in more or less quantity within 2-3 days. Valves are checked using soap water, no problems found. The alloys look good at the circumference and not bent anywhere, but then I have nothing to doubt other than the alloys. The neighbouring cycle shopkeeper says it may be normal on cold days for air to shrink(which I do not believe).
Previously one tyre was caught leaking air at the rim and tyre junction, which was solved by removing and refitting properly.
Or is that only due to long parking durations of 8-10 days?

[razeetg]

I have a similar problem with my Ford Fiesta (2008 model 1.4 TDCi). There was an air leak in the rear left tyre. I had replaced all four tyres less than a month before that. Figured it was a leak between the wheel rim and the tyre. Got it fixed (I don't know what they did the first time). It was all fine for a few months, but then it started again. I too it to a tyre specialist, who said they'll try to fix it, but there's a chance that it won't work. They mostly cleaned up the inner sides for the wheel (is it corrosion causing it?) Again, it worked fine for over a month, but then it started leaking again and now within a week, it goes almost flat. Now I'm not sure what to do. Any advise? Will I have to change the wheels?

[razeetg]

Can someone suggest a good tyre specialist in Bangalore? I'm quite convinced that its a problem with the wheel and not tyre. But would like to confirm and get some expert help before changing them.

[Aroy]

Originally Posted by razeetg

I have a similar problem with my Ford Fiesta (2008 model 1.4 TDCi). There was an air leak in the rear left tyre. I had replaced all four tyres less than a month before that. Figured it was a leak between the wheel rim and the tyre. Got it fixed (I don't know what they did the first time). It was all fine for a few months, but then it started again. I too it to a tyre specialist, who said they'll try to fix it, but there's a chance that it won't work. They mostly cleaned up the inner sides for the wheel (is it corrosion causing it?) Again, it worked fine for over a month, but then it started leaking again and now within a week, it goes almost flat. Now I'm not sure what to do. Any advise? Will I have to change the wheels?

I suspect that the rim is causing the leak. Many a times a small undulation on the rim leaves some space between the rim and the tyre, which results in a slow leak. Here are some suggestions
. Unmount the tyre from the rim, and give the rim a thorough wash with detergent.
. If there are traces of rust, sand it off.
. Check the rim with your fingers to check for any bumps and scratches.
. If you find any sand them clean and smooth
. Now paint the rim inner edges with a rubber solution. Let it dry for at least a few hours.
. Mount the tyre, inflate it to at least 40 PSI, and test for small leaks. You may have to give it some time if the leak is small. If you detect the leak, well and good.

If no leak was detected and the tyre again looses air in a month, then it is the time to change the rim.

[mpksuhas]

Originally Posted by razeetg

Can someone suggest a good tyre specialist in Bangalore? I'm quite convinced that its a problem with the wheel and not tyre.

Razeetg, most of your queries are answered by Aroy. Regarding tyre shop in Bangalore you can contact Madhu's . It is owned by BHPian Nikhil and their service is superb.
I too faced a similar issue few weeks back, however mine was due to faulty valve neck.

[suresh_gs]

Originally Posted by razeetg

Can someone suggest a good tyre specialist in Bangalore? I'm quite convinced that its a problem with the wheel and not tyre. But would like to confirm and get some expert help before changing them.

You can try Hercules tyres at Seshadripuram.

[razeetg]

Originally Posted by Aroy

I suspect that the rim is causing the leak.
=============
If no leak was detected and the tyre again looses air in a month, then it is the time to change the rim.

Thanks Aroy, I've had that done twice, except for using the rubber solution. I will try that.

Originally Posted by mpksuhas

Razeetg, most of your queries are answered by Aroy. Regarding tyre shop in Bangalore you can contact Madhu's . It is owned by BHPian Nikhil and their service is superb.
I too faced a similar issue few weeks back, however mine was due to faulty valve neck.

Originally Posted by suresh_gs

You can try Hercules tyres at Seshadripuram.

Thanks for the suggestions. I will try them out.

[GurgaonTiger]

Originally Posted by rajivanoj

it might be due to air hole, which is manufacturing defect of tyres, it is like pin hole, which is very hard to find , can be located with soap solution, i had this problem, where the air pressure dipped in a week time, in certain single wheel. then i found it. It was moulding defect

wow, never heard of something like that. I dont think it could be of a mould defect.I dont think a pin hole can be left in a tyre during curing. All the air bubbles are bled out during tyre making process. The puncture in your tyre could be because of, as you rightly said, a pin hole caused by a pin on the road.