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Old 08-01-2015, 12:02 PM   #1
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On the road, help please!

We are just a few miles out of town and the TPMS on our 3/4-ton diesel RAM went off. The front tires are both at 63, but it is saying they are UNDER-inflated and should be at 60. The truck manual isn't helpful in the least. With more weight on the front end thanks to the ProPride, do we increase pressure or take them down to 60? We took the rig over the CAT scales last weekend and front axles weighed 4600 lbs and rear axles weighed 5060. We did raise bars on hitch another 1/4" to reduce porpoising.
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Old 08-01-2015, 12:11 PM   #2
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On the road, help please!

The overnight "cold" pressure is the default. This is the reference number when tire pressure questions are debated. If one sez he has 41-psi, it is meant as the measure of the cold tire.

Pressure rise from that point occurs as the tire heats.

But a pressure rise of 10% or more means the tires had too little inflation pressure to begin with.

The "hot" number (after an hour or more of driving) is just a check to see if the pressure rise is within bounds.

The tires may have started too low, and are now hotter than they should be. (Not enough air pressure).

This does not exclude a faulty TPMS.
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Old 08-01-2015, 12:19 PM   #3
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I think my 2013 Ram CTD wants to see 65# in the front. If your system just alarmed at 63 and says you should be at 60 that sounds like a TPMS problem, not a tire problem, to me. What are the rears set at? At any rate, if the tires look OK I think you are OK to drive a few miles. Do you have a manual tire pressure gauge?

Al
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Old 08-01-2015, 12:43 PM   #4
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It was no more than 15-20 minutes after we started driving. The sticker on the door says 60 for the front and 80 for the back. We ended up letting a couple pounds of pressure out of the tire to at least get the alarm off and then drove slowly to the next exit (about 10 miles), during which time I watched the pressures and they did climb a bit. Unfortunately, we discovered that our gauge only goes up to 60-- John went into the truck stop to see if there was a truck gauge for sale. We do have a compressor and can add air. The rear tires seem to be moving up a bit too, but not as much.
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Old 08-01-2015, 12:54 PM   #5
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I would get a manual gauge and set the tire pressure base on what is written on the tire sidewalk. This is supposed to be done cold. Then I would reset the alarm limits on the TPMS based on the tire specs.
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Old 08-01-2015, 12:56 PM   #6
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Checked tire temps with laser thermometer. Side in shade is about 109-111, front and back. Side in hot New Mexico sun on the asphalt is mid 120s, from and back.
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Old 08-01-2015, 01:30 PM   #7
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Checking pressure when cold (before you move the vehicle) is the presure spec given. After moving the vehicle the pressure will rise as the tires heat up. If the pressue cold was not high enough the hot prressure will increase greatly as the tires are getting hotter because of low tire pressure. Removing air out of a hot tire may be the worse thing to do as they may have been low to start and the tire heated up.

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Old 08-01-2015, 01:38 PM   #8
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As noted....

Get a manual gauge and set cold to load and re-calibrate.

Bob
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Old 08-01-2015, 02:21 PM   #9
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My mistake - 60 psi on my truck

Quote:
Originally Posted by Al and Missy View Post
I think my 2013 Ram CTD wants to see 65# in the front. If your system just alarmed at 63 and says you should be at 60 that sounds like a TPMS problem, not a tire problem, to me. What are the rears set at? At any rate, if the tires look OK I think you are OK to drive a few miles. Do you have a manual tire pressure gauge?

Al
I went out and checked my truck. I was mistaken, the front pressure is, in fact, 60 psi, not 65 as I stated above. Still I am surprised that your system alarmed at 3 psi over. I think I have seen rises of at least that much with no reaction from my system.

What year is your truck? Can you reset the TPMS once pressures are set, or is it like mine, the pressures are pre-set? If a late model, do you have the light load switch on? That drops the setting for the rear to something like 45#.
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Old 08-02-2015, 01:12 PM   #10
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Laser thermometers. Seen them mentioned often, but never paid much attention. So, are they accurate, worth getting, better than a manual tire gauge, etc. ?
Mike
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Old 08-02-2015, 02:52 PM   #11
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Laser thermometers. Seen them mentioned often, but never paid much attention. So, are they accurate, worth getting, better than a manual tire gauge, etc. ?
Mike
In the human experience to find faster and/or easier solutions the results are not always what one would hope for.

A laser thermometer takes out some of the effort and possibility contact with dirty compoenant of the trailer. And it is a good way to understand differences in tires on the same vehicle usded in the same manner assuming the user measures the same place on each tire. However in making a comparision between tire temperature and tire pressure there are possible flaws. It should be as accurate as thumping the tire. Oh and a laser thermometer can be fun.

Just don't expect it to determine real accurate tire pressure.

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Old 08-04-2015, 12:30 AM   #12
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Update

An update: the TPMS alarm on the truck never went off again. It was odd-- according to the TPMS the cold pressures before departure were all within a pound of the recommended pressures. I kept the display on the TPMS screen for the rest of the drive, and the pressures stayed fairly close to where they were when the alarms went off (but the last hour of our 3-hour drive was in rain and cooler temperatures).

We'd purchased a solid pressure gauge some time ago, and belatedly discovered that morning that it topped out at 60 pounds (we've never owned a vehicle that required tire pressures that high). A new one purchased at the truck stop was junk, but once we dragged out the air compressor, we found that its reading was always about two pounds higher than what the TPMS said.

We checked the tires this morning just prior to returning home, and added/released air until the numbers were precisely as recommended by the TPMS. The numbers changed significantly more on the drive home than on the drive up, but the TPMS didn't seem to care in the least.

I don't get it, unless it was a fluke or the system just didn't like the two front tires being a pound or so low to start off with.

Thanks to everyone who chimed in quickly. It's a bit unnerving when that alarm goes off and the display lights up!
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Old 08-04-2015, 04:27 AM   #13
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A calibrated Longacre Racing tire pressure gauge is worthwhile. If it's off it can sent back for repair. Your tire dealer should have a master gauge which rules the others in his shop. If not, maybe time for another dealer.

The combined cost of ten tires (maybe more) is significant. And running ten percent below required pressure (measured wheel load) is considered a flat.
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Old 08-04-2015, 10:19 AM   #14
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nonameinnm,
What year is your truck? My 09 has two levels of tire pressure settings, changed with a button on the dash. You need to be set in the higher range.
Always run the the front with a minimum of 65.
I use 70 psi both front and rear and the truck handles the load fine and the tires are wearing evenly.
There is a good chance that you have a sensor that is going bad. I have been having the worthless tpms light go off but whenever I am near a shop that diagnose the sensor the light goes back off. Next spring I am getting new tires and throwing in new sensors.
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