Hello. I have a rather odd tire pressure problem with my TSX lately. the "check tire pressure/tire pressure error" message popped up and I saw my front passenger side tire was at 26 PSI. I checked the tire visually but it doesn't seem to be flat. I went to the gas station and pumped it back up to 32. Problem solved (for now). couple of weeks went by and it drops back down to 26 (same tire). Does anyone know what is going on?

 

I'll take a shot at this - maybe a leak?

 

I think cold air also makes tires lose pressure faster as well.

I need to check mine. I haven't in a while.

 

How many times will this question be asked?
Your tires when they have been sitting are filled with cold air pressure. When you drive around and get your tires warmed up than they will be back to normal pressure on your MID. Only fill your tires after a good drive, when they would still be hot.

Now since youve messed with the PSI, I would recommend you to drive a while and deflate/inflate the necessary tires to these settings. 32PSI Front, 30 Rear

 

It is meant to be 32psi with cold. Measure it when it is cold, drive to the station and measure it when hot. Subtract the two and the difference is what you should add on top of the pressure you are filling up to at the station.

 

If I'm understanding the OP's message correctly, the problem is with just one tire. If that's the case, I reckon he must have a slow leak in that tire.

The two most obvious possibilities that occur to me are an embedded nail (or other sharp object) and a valve (in the valve stem) that's letting air gradually escape.
(I once found a car key embedded in one of my tires. You have to wonder how, in being run over, the key sort of "stood up" so that it could puncture the tire. I can picture it happening with a nail, but it's kinda hard to envision a key doing it.)

Note that a radial tire has to be WAY down on air before it appears anywhere close to being flat.

 

put like 40 psi on your way home, and measure by deflating when its cold outside.....like midnight or something.....

 

Even though this is common sense, I had to ask. Did the OP measure manually with a tire gauge too? He only mentioned he "visually inspected' the culprit tire.

To check if there is a slow leak, get an ice cream 4L tub of water with soap bubbles. Pour it around the tire and see if you see any air leakage that blows bubbles.

 

I THINK I FOUND THE CULPRIT!

Don't know why I didn't spot this before...



Could this be it? As you and I could see... the tear goes right to the inside of the tire. Could this be the cause of my very gradual air loss? It takes almost a month for the TP error to come back after I fixed the pressure. How can I fix this tear? I don't supposed I could just tape it...

 

um... yeah, i'd say that's the problem there dude.

fix? replace the tire. not much you can do when its a tear, especially on the sidewall...