tire pressure monitor

[Rwake901]

Just returned from our first trip after installing a tire pressure monitor system. I normally run 90 PSI in all my tires. Once they warm up they are all over the place. Mostly around 98/101 PSI. My inside right rear dual tire gets up to 104 PSI. Is this normal to have one wheel that much higher? Or could I have a bad sensor? Thanks

[Rwake901]

mtrumpet wrote:
On mine, the pressures and temps are all right where they should be when checking the TPMS in the morning before a trip. However, once going down the highway, those temps and pressures can be all over the place, which is normal when taking into account all of the variables (as others have mentioned) once you get going down the road, all remaining within the safety parameters set in the TPMS.

This is how mine is too. Sounds like it's pretty normal then. Thanks

[mtrumpet]

On mine, the pressures and temps are all right where they should be when checking the TPMS in the morning before a trip. However, once going down the highway, those temps and pressures can be all over the place, which is normal when taking into account all of the variables (as others have mentioned) once you get going down the road, all remaining within the safety parameters set in the TPMS.

[Rwake901]

wallynm wrote:
inside dual hotter than outside dual - on a gas rig check the exhaust pipe location that may contribute to one tire more than others

I thought about that too but the exhaust comes out the left side..

[rgatijnet1]

On any dual tire, with valve extensions, the tire temperature is not accurate because the sensor is exposed to the air flow and too far away from the tire itself.

[wallynm]

inside dual hotter than outside dual - on a gas rig check the exhaust pipe location that may contribute to one tire more than others

[JimM68]

Normal.

Our pressures rise 20 psi or more when the tires heat up.
Sunny side always shows hotter.
good tip about the toad tire in front of the diesel exhaust, ours is on the left, explained now, thanks.

[Rwake901]

GMandJM wrote:

hanzfranz60 wrote:
If these are the external mount type, try moving that sensor to another tire and see if the same discrepancy happens with the replacement unit.

^This, but it's likely just normal difference between inside and outside tire. Was there also a temp difference?

The temp's were a lot closer I don't remember exact numbers. It was just strange that it's the inside duel that the pressure goes up more on, away from the sun. I might try moving that sensor to another tire and see what happens.. Thanks

[GMandJM]

hanzfranz60 wrote:
If these are the external mount type, try moving that sensor to another tire and see if the same discrepancy happens with the replacement unit.

^This, but it's likely just normal difference between inside and outside tire. Was there also a temp difference?

[dan-nickie]

Normal.

[Halibut214]

AFChap wrote:
Sounds normal to me. I have run a tpms that shows temp for several years. Tires on the sunny side will be hotter. Tire closer to engine/exhaust heat will be hotter. Inner duals can be hotter due to less air circulation. And my right front toad tire runs considerably hotter (15+ degrees) than the other toad tires most likely because the big diesel exhaust dumps out right in front of it. All kinds of things can affect the tire temp, and therefore the psi also.

Ditto!

[hanzfranz60]

If these are the external mount type, try moving that sensor to another tire and see if the same discrepancy happens with the replacement unit.

[AFChap]

Sounds normal to me. I have run a tpms that shows temp for several years. Tires on the sunny side will be hotter. Tire closer to engine/exhaust heat will be hotter. Inner duals can be hotter due to less air circulation. And my right front toad tire runs considerably hotter (15+ degrees) than the other toad tires most likely because the big diesel exhaust dumps out right in front of it. All kinds of things can affect the tire temp, and therefore the psi also.

[L2R]

I don't have tpms but I do have a digital temperature monitor.
My first trip, the left side tires were 15 lbs higher. It took a minute to realize that the sun was shining on them.

Others will chime in but I think a few lbs one way or the other isn't a big deal.