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Tire Pressure

3K views 14 replies 9 participants last post by  Victor1960 
#1 ·
My driver side rear tire pressure keeps falling from the 37 level or so down to 29, and so I get the Tire Pressrre Low Message. I have inflated it back to 36 (as instructed) 3 or 4 times, and yet it still goes back to 29 after a few days. Yet it never goes below 29. Do you think this is a slow leak or what? Thanks!
 
#2 ·
I can't tell if it's a slow leak from here, but a tire tech might be able to tell if you take it into a tire store.
 
#3 ·
How are you measuring it?
Using a halfway decent standard tire gauge, or just the tpms sensor?

You might have a bad tpms if a regular gauge doesn't see the drop in pressure.

If you DO see the drop in pressure with a regular gauge, you probably have a slow leak. The valve stem can cause a slow leak, as can a hunk of dirt in the stem, or you may have a nail somewhere...

A good tire shop can check for you if external gauge shows drop.
 
#6 ·
Check out tire.rack's tire tech pages.

The Michelin side wall probably indicates Max Inflation Pressure, unless yours is unique. You never want to go over that COLD.

The door jamb number is what the engineers at Jeep recommend for a decent combination of ride comfort and tire longevity under nominal load. There's a pretty good write up on page 379 of the owners manual, however, that is GENERAL information and may not apply to your driving situation, or even your tires.

A good tire shop will typically be more accurate if you regularly run your Jeep heavily loaded, as you typically want to add more pressure. The owner's manual statement about 75 mph on snow tires must be written by someone not familiar with today's premium snows... e.g. those which set an ice speed record in excess of 200 mph.

If you drive a lot on freeways, you can usually get a bit better handling and response by going up just few pounds, without risking excess wear--presuming the tires are good enough to handle it.

I usually run 36-38 lbs on the Michelin Latitudes, and about the same on Nokian Hakka 7 studs, taking a possible very small penalty in ride quality for better driving feel.
 
#7 ·
I had an 08 G35 with this same problem. Long story short- took it back to dealer and for a last ditch check they aired the tire up to 50 or 60 psi then dunked it. We saw the smallest bubble trail from an itty bitty cut. At proper air pressure it would leak slowly until it sealed itself at 26 psi.
 
#13 ·
Could it be the same way to change from mph to kph? On mine it's the right arrow key.
Thanks, I have the option to change to Kph which is what we use down here...but didnt see the option to change the tire presure...but...now that you say it I have to go and check it again...could it be that obvious and I didnt do it ?!...well the Jeep is at home so I'll try it tonight !. Thanks again.:)
 
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