Quote:
Originally Posted by Stephen12ZL1
Yep...with the Z/28 wheels the damn retaining nut to the TPMS sensor will loosen and leak down. This happened to me twice and lost enough pressure on track I had to cut a session short. Problem is you can overtighten the sensor retaining nut and cause them to leak as well. There is no good seal at the wheel and I purchased a new TPMS sesnor just to see what is included. I am still experimenting as to what works best with the least hassle. There is a little nylon gasket/washer included with the new sensor purchased at Advance Auto that is not present from the facotry TPMS. If the torque is perfect, then nothing ever leaks down. If it is even slightly off, air leaks slowly and my tires will leak down after the car sits for a week or ao. My tire shop swapped two tires for me in the front and must have waved their magic wand on those two as they haven't been an issue since the tire swap. I thought I was the only one with these issues...let me know if you find the solution to this seemingly simple issue. In my ZL1 which had the OEM black wheels like the 1LE, I never once encountered anything like this.
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Thinking out loud:
I'm very surprised that I've never heard of this issue before. Do the rebuild kits come with the new retaining nut, gasket, etc.? Discount tire is closed today, so I'll stop by them tomorrow. I'm wondering if this tire (MPSC 2) has anything to do with the issues I've had.
In other words, I'm wondering if I should replace MPSC 2s with my Trofeo R tires as well. I've had the issue only when I lowered the pressures further, and I'm wondering if what the guy at Les Schwab said has a part in what happened. Does the tire touch the sensor by any means due to low profile?
To recap possible causes:
- GM's 26 PSI min pressure warning might be there to cover this issue, too.
- Les Schwab technician said it happens on low profile tires where the stem is touched by the tire surface, and it spins.
- MPSC 2's sidewall might be softer than the Trofeo R's but Stephen said he had this issue, too, presumably on Trofeo Rs. I remember he was never using low pressures, either, which conflicts with my initial theory of too low pressures causing it.
- What's special with this wheel? Why did it happen with this wheel to Stephen and I, but never with 1LE/ZL1 wheels?
- FYI, my 2013 C6 Z06 wheels were ultra low profile, but they never had this issue.
- Could it be heat? Perhaps I overheated tires to the point where the stem's seal got gooey? When I dropped pressures, the tires also got hotter due to more flexing...
It will be very hard to get to the bottom of this. If anyone else also had this issue, or have an idea, please let us know!