Join Date: Apr 2007
Location: Central Illinois
The last couple times I had a tire replaced, I told them I'd just recently swapped the valve stem and sensors, and they didn't try to push any TPMS service on me.
I've swapped sensors on a different vehicle's 235/55 R18s. Our G8's lower profile tires may prove a little tougher, but here's what I did:
First, note that this was a second set of wheels/tires with the valve stem core removed (a tool to do so is only a few bucks). The vehicle in question had a full set on it.
Drove the front of the vehicle up on ramps.
Placed a wheel/tire face up under the front jacking point, with the valve stem NOT directly underneath the jacking point.
Put the scissor jack in between car and tire near the rim of the wheel. I put a piece of dense foam between the jack base and the wheel rim to avoid damage.
Extend the jack, pressing down on the tire until the bead pops off. Sometimes, I had to rotate the tire some and do a second point several inches away for the whole bead to unseat.
After that, I used some pieces of scrap 2x4 to wedge the sidewall down away from the bead seat, exposing the sensor, and I was free to swap it at that point.
Remember not to position the jack aligned with the valve stem. You may end up snapping the sensor off when you are jacking and damage the valve stem. And retrieving the loose sensor/pieces could be a pain in the ass.
To reseat the tire, I spread a thin coat of soapy water around the bead with my fingers. I supported the tire (not the wheel) from underneath in a couple places with some spare wood and put my knees/weight on the face of the wheel. With my compressor regulator set to 100+ psi, it provided sufficient flow to get the bead to reseat.
Something else to note: I was using two-piece Race Ramps and I could pull the inclined part of the ramp out of the way. A one piece ramp may get in the way of the jacking point. You could put the front up on jack stands if your ramps don't accommodate this.
Actually, thinking back, I was in the middle of a saga of TPMS issues on my wife's van. I did work my way around the vehicle at one point, jacking up the corner, putting in a jack stand out of the way, taking the wheel off, going through the process I wrote above, one corner at a time.
2009 SRM GT - Premium, Sport, Sunroof - HSV triple gauges and trim, HSV Supersport Red/Black Steering Wheel, GXP rear sway bar, GXP Diffuser, Rotofab, SOLO Axlebacks, Magnaflow Cats, Red Hot shift knob, Autodim mirror, Removed intake cover, Chrome lug nut covers, Infinity door speakers, 10" DVC RF Sub, Switchbacks, Slotted rotors & Braided stainless brake hoses, Cortex tuner
Last edited by J Wikoff; 07-11-2018 at 02:08 PM.