Tyre losing air pressure & fast!

vishnuvijay · 3rd April 2008, 14:11

one of my Kumho Ecsta AST KU25 tubeless trye is loosing air pressure very fast. i corrected the air pressure to 30 psi and 2 days later i found it to be 11 psi. filled in air again, the guy at the ioc pump said there is no leakage.

went on a trip (300 km (first day) + 300 km (second day) ) checking air pressure in between and found it not to be decreasing. came back home and the next day ( again 2 days passed since i last filled it) found that a good amount of air has escaped.

is it a puncture or is there something else wrong.

bblost · 3rd April 2008, 14:17

check for young kids, old disgruntled men, ex lovers around your car.

condor · 3rd April 2008, 14:22

Possibly a flat tyre. Get it fixed.

headers · 3rd April 2008, 14:25

Quote:

Originally Posted by vishnuvijay

one of my Kumho Ecsta AST KU25 tubeless trye is loosing air pressure very fast. i corrected the air pressure to 30 psi and 2 days later i found it to be 11 psi. filled in air again, the guy at the ioc pump said there is no leakage.

went on a trip (300 km (first day) + 300 km (second day) ) checking air pressure in between and found it not to be decreasing. came back home and the next day ( again 2 days passed since i last filled it) found that a good amount of air has escaped.

is it a puncture or is there something else wrong.

Could be that the tubeless valve is leaking.. or you could have a small puncture.. fill air to 5 psi more than normal and drive to a tubeless repair shop to get them check.. I'd suspect the valve..

kpzen · 3rd April 2008, 14:27

I agree with headers. I also suspect a leaking valve.

iraghava · 3rd April 2008, 14:28

Should in all probability be a puncture in the tread. Valve is also a possibility but less so since this can be detected by the pump attendant quite easily.

bottle · 3rd April 2008, 14:31

i had this problem with a faulty vavle on a new tyre.. get it checked

when they put the tyre under water you would get a bubble now and then.. so it was slowly leaking air

Jaggu · 3rd April 2008, 14:32

Check valve, also check the edges of the valve where it rests on the rim. Then move on to inspect the tyre for any nail/iron piece etc.

HappyWheels · 3rd April 2008, 14:48

when i fitted the tubeless had the same issue with a type. it was losing pressure on a regular basis. but it was on a scale of 3~5 psi in a week. When checked it was a faulty valve.

After replacing that had no issue so far.

Would suggest a quick visit to the tyre store. Faulty valve or puncture - it will be fixed and you will have some peace of mind.

spadival · 3rd April 2008, 15:35

You'll probably see a 2 inch nail embedded in the tyre. I had 3 nails embedded in my tyre before it started losing air!!

vishnuvijay · 3rd April 2008, 17:15

thank you guys for replying.

the guy at the ioc pump said there is no valve leak. i din't check for any nails. anyways i'll get it checked at a good tyre shop this weekend when i go home.

tsk1979 · 3rd April 2008, 19:27

I had a similar problem when the car had potenza.
Got it checked at the pump and even at the tire repair shop.
Immersing in water also did not show bubbles and I was in a fix. Then while checking the guy accidently bent the valve towards the right, and we saw bubbles near the valve stem. This used to happen only when the valve stem was bent in a particular direction.
changed the valve and the problem went away.
The leak was not from the top of the valve(what pump guys check), but near the stem, where the valve goes into the tire.

HappyWheels · 3rd April 2008, 20:44

Quote:

Originally Posted by tsk1979

... The leak was not from the top of the valve(what pump guys check), but near the stem, where the valve goes into the tire.

Exactly the same problem that I faced! The base was having a leak!

headers · 3rd April 2008, 21:22

Quote:

Originally Posted by iraghava

Should in all probability be a puncture in the tread. Valve is also a possibility but less so since this can be detected by the pump attendant quite easily.

Boss..i'd doubt a pump attendant diagnosing a valve leak! We are not in your esteemed company you see

Quote:

Originally Posted by vishnuvijay

thank you guys for replying.

the guy at the ioc pump said there is no valve leak. i din't check for any nails. anyways i'll get it checked at a good tyre shop this weekend when i go home.

How did the pump guy check the valve leak?

Quote:

Originally Posted by tsk1979

I had a similar problem when the car had potenza.
Got it checked at the pump and even at the tire repair shop.
Immersing in water also did not show bubbles and I was in a fix. Then while checking the guy accidently bent the valve towards the right, and we saw bubbles near the valve stem. This used to happen only when the valve stem was bent in a particular direction.
changed the valve and the problem went away.
The leak was not from the top of the valve(what pump guys check), but near the stem, where the valve goes into the tire.

This is exactly the weak point.. I've had the same in my Indica. And only good / experienced tyre guys will find the problem!

Quote:

Originally Posted by HappyWheels

Exactly the same problem that I faced! The base was having a leak!

The tubeless tyre valves have to be seated properly on the rim, else this leak will happen. Also corrosion in the area can tear the valve seats.

Just my 1 paisa!!

tsk1979 · 3rd April 2008, 21:48

@headers, if the leak is from the top of the valve it is detectable as the pump attendents often put saliva on it after filling in air(I know its sounds gross, but thats how I have seen it being done).
But when the leak is from the bottom stem ... You need an expert.

3rd April 2008, 14:11	#1
vishnuvijay BHPian Join Date: Apr 2007 Location: Cochin Posts: 173 Thanked: Once	Tyre losing air pressure & fast! one of my Kumho Ecsta AST KU25 tubeless trye is loosing air pressure very fast. i corrected the air pressure to 30 psi and 2 days later i found it to be 11 psi. filled in air again, the guy at the ioc pump said there is no leakage. went on a trip (300 km (first day) + 300 km (second day) ) checking air pressure in between and found it not to be decreasing. came back home and the next day ( again 2 days passed since i last filled it) found that a good amount of air has escaped. is it a puncture or is there something else wrong.
	() Thanks

3rd April 2008, 14:17	#2
bblost Team-BHP Support Join Date: Jul 2007 Location: Hyderabad Posts: 11,302 Thanked: 18,014 Times View My Garage	check for young kids, old disgruntled men, ex lovers around your car.
	() Thanks

3rd April 2008, 14:22	#3
condor Distinguished - BHPian Join Date: Jun 2006 Location: Speed-brkr City Posts: 16,242 Thanked: 16,902 Times View My Garage	Possibly a flat tyre. Get it fixed.
	() Thanks

3rd April 2008, 14:27	#5
kpzen Senior - BHPian Join Date: Oct 2004 Location: Faridabad Posts: 5,608 Thanked: 1,884 Times View My Garage	I agree with headers. I also suspect a leaking valve.
	() Thanks

3rd April 2008, 14:28	#6
iraghava Senior - BHPian Join Date: Oct 2005 Location: Bhaiyyaland Posts: 7,993 Thanked: 281 Times View My Garage	Should in all probability be a puncture in the tread. Valve is also a possibility but less so since this can be detected by the pump attendant quite easily.
	() Thanks

3rd April 2008, 14:31	#7
bottle Senior - BHPian Join Date: Sep 2006 Location: Chennai Posts: 1,641 Thanked: 295 Times View My Garage	i had this problem with a faulty vavle on a new tyre.. get it checked when they put the tyre under water you would get a bubble now and then.. so it was slowly leaking air
	() Thanks

3rd April 2008, 14:32	#8
Jaggu Team-BHP Support Join Date: May 2004 Location: Bangalore Posts: 20,379 Thanked: 17,317 Times	Check valve, also check the edges of the valve where it rests on the rim. Then move on to inspect the tyre for any nail/iron piece etc.
	() Thanks

3rd April 2008, 14:48	#9
HappyWheels Senior - BHPian Join Date: Dec 2007 Location: Bangalore Posts: 4,145 Thanked: 571 Times	when i fitted the tubeless had the same issue with a type. it was losing pressure on a regular basis. but it was on a scale of 3~5 psi in a week. When checked it was a faulty valve. After replacing that had no issue so far. Would suggest a quick visit to the tyre store. Faulty valve or puncture - it will be fixed and you will have some peace of mind.
	() Thanks

3rd April 2008, 15:35	#10
spadival Senior - BHPian Join Date: Oct 2004 Location: Melbourne, AU Posts: 1,772 Thanked: 29 Times View My Garage	You'll probably see a 2 inch nail embedded in the tyre. I had 3 nails embedded in my tyre before it started losing air!!
	() Thanks

3rd April 2008, 17:15	#11
vishnuvijay BHPian Join Date: Apr 2007 Location: Cochin Posts: 173 Thanked: Once	thank you guys for replying. the guy at the ioc pump said there is no valve leak. i din't check for any nails. anyways i'll get it checked at a good tyre shop this weekend when i go home.
	() Thanks

3rd April 2008, 19:27	#12
tsk1979 Team-BHP Support Join Date: Feb 2005 Location: San Jose, CA Posts: 23,688 Thanked: 23,494 Times View My Garage	I had a similar problem when the car had potenza. Got it checked at the pump and even at the tire repair shop. Immersing in water also did not show bubbles and I was in a fix. Then while checking the guy accidently bent the valve towards the right, and we saw bubbles near the valve stem. This used to happen only when the valve stem was bent in a particular direction. changed the valve and the problem went away. The leak was not from the top of the valve(what pump guys check), but near the stem, where the valve goes into the tire.
	() Thanks

3rd April 2008, 21:48	#15
tsk1979 Team-BHP Support Join Date: Feb 2005 Location: San Jose, CA Posts: 23,688 Thanked: 23,494 Times View My Garage	@headers, if the leak is from the top of the valve it is detectable as the pump attendents often put saliva on it after filling in air(I know its sounds gross, but thats how I have seen it being done). But when the leak is from the bottom stem ... You need an expert.
	() Thanks