I'm not reporting a failure with the sensors, more of just a failure in the design of the system. Before going into it, the background of how I came to this discovery, 3 months ago, after getting new tires, my Low Pressure light came on, all tires were at the correct pressure. After towing a 9K lbs boat to florida for a friend, the whole way the truck felt like the steering was loose in the front end, and the back felt like it was floating side to side. Got down there, had a dealer check the truck out , steering linkage was solid, swaybars solid, nothing wrong mechanically. Now the problem seems to only happen above 55, at 75-85 almost feel like the truck is going to go off the road. So I get back up north, take the truck to get tires rotated and road force balanced, they fixed the floating in the rear end, and added some pressure to the front tires. Going down the road, since that time the truck seems to be more under control, not 100% but a lot better. So yesterday I took my truck to the dealer to get the tire pressure sensors checked and replaced if necessary. after 30 mins, they said they just needed to adjust the pressure, Service Manager said: "Manufacturer Specs for the TPMS system are: 65 PSI in front, 80PSI in back", so I figure great, I'm out there in less than an hour and only out $40. On my way home up to 65, I noticed the truck seemed to be wandering a bit, It was fine in the morning, wind was blowing a bit, so I ramped it up to 75, and what would you know the truck wanted to wander all over the place. My tires were at 80PSI front 70 PSI rear that morning. So I call the srvc manager, I tell him, the truck is all over the road, he says I can up the pressure, but the light will come back on. So my choices are drive with the annoying light or drive with an out of control truck.
In my book that constitutes a total FAIL for a system that is supposed to improve safety in the truck. For a car or an SUV those pressures are fine, but not for a truck pushing 9300lbs, its completely unsafe.
Now a question for the techs, is there any way to tweak the TPMS system, like changing the parameters, I honestly dont understand why it would think there is low pressure when the tires are filled above what they are supposed to be, according to the specs.
Work Truck: 2010 F350 KR Oxford
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AirDog 100 from Pure Flow Industries
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