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Old 03-15-2015, 03:12 AM   #1
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TPMS Sensors Won't Register Air Pressure on Inner Duals

We have the braided steel extensions on the inner duals on our Bay Star. I'm having a problem getting the air pressure to register. On all the other tires I could hear air escape a little as the sensor was installed and the valve stem core was depressed, but not on the inner duals. My manual air pressure gauge reads 90 lbs. It seems like the sensor can't depress the valve enough to open it. I have swapped sensors with no difference. The system is a TST. I originally had the 507 Flow Thru sensors, but couldn't fit them on the front wheels (couldn't clear the wheel liner). TST told me the regular 507 sensors would fit, if the anti-theft shell was removed. I sent all 6 sensors backroad them, and they swapped them for the cap type, and removed the shells for me. Regardless of the type, the sensor can't depress the valve stem core enough to let air pressure get to the TPMS sensor.

Has anyone had a problem like this? Does anyone have any suggestions. I'm hopping I don't have to have the tires dismounted and new valve stems installed.

I have this same thread posted in the Newmar Owners forum, but since this issue is not specific to Newmar coaches, this is probably a better place for it, and asked the moderator to delete it over there.


Thanks is advance for any help!
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Old 03-15-2015, 08:17 AM   #2
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The valve extensions have a metal type cable inside them that run the length of the valve stem. There should be an adjustment so that when you put the TPMS on it depresses the metal stem to allow the pressure to escape the tire. I had to adjust several of mine to make them work.
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Old 03-15-2015, 08:35 AM   #3
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Back out the valve stem on the tire a 1/4 turn at a time till it works. I had the same issue with mine with stems and that is what I was told to do by TirePressurePro at a rally.
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Old 03-15-2015, 09:46 AM   #4
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Agree, take a real good look at the stem to see if it is depressed. May have to replace the stems if they have been screwed in to hard. Make sure the batteries are good in the sensors. I usually replace mine at the start of a major trip. You may not get a low battery alarm from the sensor if it has been setting a long time.
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Old 03-15-2015, 11:02 AM   #5
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I have TST 507s and after about a year with no reliable inner rear readings, I found the answer and the solution.

Check the diameter of the schraeder valve head on your extensions. Some are very small and will block the sensor hole on the tpm sensor. I found and installed new extensions which had a larger diameter head on the schraeder valve and things have worked perfectly since.
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Old 03-15-2015, 11:05 AM   #6
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Dually Valve Stems will solve your problem and will also prevent the possibility of having any leaks from the extensions.

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Old 03-17-2015, 06:04 AM   #7
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Quote:
Originally Posted by 38 Special View Post
Back out the valve stem on the tire a 1/4 turn at a time till it works. I had the same issue with mine with stems and that is what I was told to do by TirePressurePro at a rally.
I tried this yesterday afternoon. After what seemed like 1 1/4 turns, the core valve, ended up in my hand. You are correct. The valve stem core was attached to a flexible cable. The bad news was, because of a slight bend in the entension, I could not get the cable to seat properly to be able to reattach the core. I ended up having the guys at BWI Storage, remove the outside tire, so that we could remove the extension, put it back together, and then remount the tire. Before anyone gets too excited, prior to being an RV and Boat storage business, it was a trucking company. So the guys that did the work, and the tools they used were for semi trucks. I made a donation to their lunch fund, as a way to say thank you. So now I have 4 out of 6 wheels with tpms sensors. I still haven't solved my problem....yet.

If anybody is looking for a place to store their coach in the Baltimore area, I can personally recommend BWI Storage. With them, it's not just about the $$$.

I'm not affiliated with BWI Storage. I am just a customer, who believes in supporting a business that treats people right!
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Old 03-17-2015, 06:15 AM   #8
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Dually Valve Stems are the only way to go. Had the same problem before installing new stems. Working great for years now.
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Old 03-17-2015, 07:20 AM   #9
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Dually Valve Stems are the only way to go. Had the same problem before installing new stems. Working great for years now.
X-2

However, some people just won't spend the time and money for the Dually Stems. Then they end up posting their problems here hoping to discover that "magic cure" but the ONLY cure is to get RID of the extensions.

As the adage goes, You can lead a horse to the water but you can't make him drink it.

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Old 03-18-2015, 06:39 PM   #10
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X-2

However, some people just won't spend the time and money for the Dually Stems. Then they end up posting their problems here hoping to discover that "magic cure" but the ONLY cure is to get RID of the extensions.

As the adage goes, You can lead a horse to the water but you can't make him drink it.

Dr4Film ----- Richard
Or Some People have to prioritize their expenses. I understand your reasoning, and I will eventually get Dually Stems. I was looking for the "quick fix" because right now I'm trying to concentrate on setting up our Jeep Cherokee Limited as our 4 down toad.

I will put good Dually valve stems on, but I estimate that will end up costing me $200 - $300 before it's all said and done. So yeah, I was looking for a cheaper short term fix.
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Old 03-18-2015, 07:05 PM   #11
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Ugh, am I reading this right? I got talked into buying a monitor system for my Canyon Star (6 monitors) and I may have to buy different valve stems to make it work? It would have been nice for the salesman at the Tampa show to explain this. I haven't installed them yet as I figured I would wait until next month when I am getting ready to make the drive out west to WY.
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Old 03-18-2015, 08:03 PM   #12
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Quote:
Originally Posted by Tetonchief View Post
Ugh, am I reading this right? I got talked into buying a monitor system for my Canyon Star (6 monitors) and I may have to buy different valve stems to make it work? It would have been nice for the salesman at the Tampa show to explain this. I haven't installed them yet as I figured I would wait until next month when I am getting ready to make the drive out west to WY.
Whoa, My braided extensions work great and I would not trade them for anything. Of all the problems I've had stems are not one them. Wait and see if you have problem first . Evidently not all braided extensions are the same. All my rear tires have been replaced and still no problems with my extensions.
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