Larry McNeil
Active Member
I think we may be allowing ourselves to chase a squirrel here. OP states his drivers side rear PRESSURE ‘jumps up’ 20 pounds when he connects his trailer. We seem to be primarily addressing Temperature. TechDude - does it really ‘jump up’ as in coincident with connection, or within a couple miles towing, or does it only become evident after an hour or more towing? If it’s essentially immediate, then clearly it’s an electrical gremlin of some sort. Also, is the pressure increased on some TPMS (OEM or aftermarket) install, or is it up by manual pressure gauge? Just things to consider before going after temperature, which does not seem likely in this case. (Or, is the tire and wheel WAY hot after towing?No trailer sensors. I do need to get some before heading down to Sebring next week.
I've noticed that as well. They the sunny side is always more but I still can't account for the extra pressure in the one tire. I took the truck to Costco and they found a very small pinhole on that tire between the sidewall and the tread that couldn't be fixed. Could it be from too much pressure when it was heating up or a defect?
Since I'm towing the Camaro down to Sebring next week, I swapped my OEM 22" Hankook's over to some new 18" Goodyear's from an F150 takeoff. I'll set them to the max pressure of 51 PSI and do a 20 mile test run with the Camaro on the trailer before I leave to see if there's a change.
Is there a possiblity that the Expedition's stability assist is kicking in too much and overheating that corner?
The only other contributor I have ever heard is something I have not confirmed- but I do have a HOTTER tire and wheel on my 17 on the drivers rear after towing. Have been told to expect it because that wheel is the ‘power wheel’ due to some conditions I’ve not sorted out yet. I guess possibilities would include the crowned roads we drive on, or even ‘god said so’, but my tire temps on drivers side rear are consistently 10 - 20 degrees higher on that wheel when towing. Don’t get it, don’t understand it, but it seems real.
Ooops, sorry, I seem have have dumped another possible squirrel into the mix!
My reasoning was sorta like this - IF the ‘power wheel’ thing is true, then more power gets transferred to ground thru that wheel, and then IF the trailer is pulling especially hard, then OP could be seeing higher TEMPS on that wheel, but I would not expect the PRESSURE transients he is seeing? Just my 2 cents!