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  #1  
Old 07-28-2014, 03:27 PM
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Tire Pressure

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!
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Old 07-28-2014, 03:43 PM
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Re: Tire Pressure

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.
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Old 07-28-2014, 04:23 PM
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Re: Tire Pressure

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Originally Posted by Dimes View Post
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!
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.
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Old 07-29-2014, 02:40 PM
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Re: Tire Pressure

I have had this issue until recently. Had tire remounted. Be sure they use plenty of the goop around the bead. Was probably some wheel corrosion.
And I had it previously on a different wheel, but that was a roofing nail!
Good luck.
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Old 07-29-2014, 02:52 PM
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Re: Tire Pressure

So, the Michelin tires say 44 Lbs at full capacity. The door says 33 Lbs. What is the correct value...and should it be different when loaded (or towing) versus empty.
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Old 07-29-2014, 05:18 PM
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Re: Tire Pressure

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Originally Posted by Burtim View Post
So, the Michelin tires say 44 Lbs at full capacity. The door says 33 Lbs. What is the correct value...and should it be different when loaded (or towing) versus empty.
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.
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Old 07-30-2014, 11:30 PM
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Re: Tire Pressure

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.
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Old 07-31-2014, 09:09 AM
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Re: Tire Pressure

Make sure the repairer is aware of the TMPS sensor so he doesn't accidentally destroy it
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Old 07-31-2014, 09:20 AM
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Re: Tire Pressure

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Originally Posted by Mozzie View Post
Make sure the repairer is aware of the TMPS sensor so he doesn't accidentally destroy it
And make sure he knows that your nice shiny rims are scratch free!
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Old 07-31-2014, 09:46 AM
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Re: Tire Pressure

You could mix up a batch of dish soap and water. Spray it all over the tire and look for the bubbles. Had success doing this with even the slowest of leaks.
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Old 07-31-2014, 10:41 AM
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Re: Tire Pressure

Quick question that maybe somebody here can help me with.
I have a 2014 Grand Cherokee Limited, in my screen I get the tire pressure in BAR, is there a way to change the display to PSI ?
Rgds. and thanks.
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Old 07-31-2014, 11:10 AM
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Re: Tire Pressure

Could it be the same way to change from mph to kph? On mine it's the right arrow key.

(edit) This way does not change from bars to psi, see post #14.
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