Tire losing pressure overtime, equalising at 15psi

[klaudmjj]

I have a Ford Fiesta mk6. My first car. I bought the car in March 2020. I've done some work on it like replacing the power steering fluid. However, I didn't notice a slightly flat tire until about a month ago. So I ordered a tire pressure gauge and checked the tire pressure on the rear driver's side tire (UK right side) it was at 15psi. So I went to my local service station and pumped up all my tires to 32psi. I just checked the tire again tonight and, its at 15 psi once again It doesn't seem to go below 15psi. How could I identify the leak? What should I look out for?
I topped up the air pressure when it was quite hot outside, so I was expecting a tire pressure drop either way. All the other tires are at 28.8-29 psi.

[klaudmjj]

Forgot to add, tires are brand new, Michelin primacy 3 195/45.

[Centurion07]

Jack it up and rotate the wheel keeping an eye out for anything sticking out of the tyre or embedded in it.

Or just take it to your local tyre place. It's a slow puncture and for the same price as a DIY kit they'll fix it for you (depending on the puncture site).

[Ozone]

I had something similar on my 3 series recently and thought I might have a cracked wheel. Went to my local tyre shop and they said the tyre beading needed to be re-seated. It sorted the problem

[Rich1973]

Fair chance that it is corrosion on the rim of the wheel if it is an alloy. Tyre place will sort it

[the tribester]

Rich1973 said:

Fair chance that it is corrosion on the rim of the wheel if it is an alloy. Tyre place will sort it

Yep, if you don't find a nail in it, then it'll be corrosion between the tyre bead and alloy wheel.

[Krikkit]

As above, if they're nearly new take it to a tyre shop and get them to remove the tyre, clean up the wheel bead and new valve.

[klaudmjj]

I was looking around the tire, there are weights on tires (Fe 5, Fe 10 etc) I'm guessing iron weights. The tire losing pressure has none, could that have something to do with it?

[Centurion07]

Take. It. To. A. Tyre. Place.

[klaudmjj]

Booked the appointment for the tires. Thanks

[E-bmw]

Tyres...… We aren't from americaland here.

[klaudmjj]

Apologies for the wrong spelling
Anyways got it fixed today at Halfords, asked the man what was wrong with it he said there was a nail in it.
Nail is still there so I'm assuming they sealed it from the inside.
There was a white "chalky" substance on the perimeter of the tyre wall what is that?
here is a picture.

[Centurion07]

I wasn't aware they would leave the cause of the puncture in-situ...usually they'd remove the offending item and plug the hole if possible depending on location.

The white stuff is the lube they use to get the tyre back on the rim.

[eybic]

I would definitely ask why they left the nail in the tyre, they should have removed it.

[Centurion07]

I guess it's possible they could have removed the one causing the leak and missed this other one.

[klaudmjj]

Centurion07 said:

I wasn't aware they would leave the cause of the puncture in-situ...usually they'd remove the offending item and plug the hole if possible depending on location.

The white stuff is the lube they use to get the tyre back on the rim.

So if they took the tyre off, they sealed it from the inside, at first I thought they just sprayed sealant inside and did a messy job. I'll check the tyre pressure in a couple of days to see if the pressure decreased. It is quite worrying that they left the nail inside tho but probably a lot of places do this.

[klaudmjj]

I sprayed some soapy water around the nail that's inside, no air bubbles at all.

[the tribester]

No way would they leave The nail in the tyre. They'd remove it, plug it, seal from the inside, and refit.
That's got to be a second nail.

[klaudmjj]

the tribester said:

No way would they leave The nail in the tyre. They'd remove it, plug it, seal from the inside, and refit.
That's got to be a second nail.

Either I'm really unlucky and drove into another nail on the way home, or they just didn't remove the nail.

[eybic]

Are you sure it's a nail? it could be the plug they use.