Mystery of the Missing PSI-Mystery SOLVED

I posted this at and got some quick responses.

Our new 2016 Winnebago ERA 70X has Continental Vanco 4Seasons tires. The front tires are supposed to be at 60 psi. The left front has had no problem maintaining that pressure, but since we bought the unit last month from McClain’s RV in Denton, Texas, the right hand front tire has had to be re-inflated a couple of times to get it from about 40 psi back to 60 psi. Just now, after a 300 mile trip over the weekend, where both fronts started at 60 psi cold, now the left front is still at 60 psi cold, but the right front is back down to 40 psi.  IMG_3701[1]

Other than the obvious answer that the tire is not holding its pressure, any ideas on what could be causing this (e.g., warped rim, etc.) Has anyone else experienced this with a new MH? Thanks, Mike

Here are some of the responses.

I experienced this with my car and they found a nail in it. Could be something like that. The tire company plugged it up (for free) and off I went again.

Nail, screw or something in the tire. Valve stem bad, loose valve core. As a last option a cracked wheel. You really need to take it to a qualified tire store and have them do a leak test. Could be simple, then again it could be serious.

Go to a good tire store and have them remove the tire and check for slow leak, probably a nail hole like pointed out above. If so, the repair is relatively simple and inexpensive; definitely get it taken care of real soon!

I went to NTB and they said they could not even lift the coach–they do not have a jack that can support 11,000 lbs.  They suggested Goodyear down the street.  Same story.  The manager suggested that I spray Windex around the rim to see if there is a leak between the rim and tire.  He also said chrome rims are notorious for developing small cracks.  I did the Windex test and did not see any bubbles.  Otherwise, he said that for this type of issue, it needs to go to an RV dealer.  So, I went ahead and filled the tire back to 60 PSI:



We will now monitor the cold pressure each morning to see how it is doing. If it fails to hold 60 psi, back to the dealership. Heads up McClain’s.

UPDATE: I checked the tire pressure this morning (after getting it to 60 psi last night) and it was back down to 40 psi.

Tire PSI

But the mystery has been solved. A responder on suggested I take it to McKinney Tire and Appliance on McDonald Street. Well, I almost did that, but the reviews of that establishment were enough to give pause. I did take it to Thomason Tire just down the street in McKinney. They had the coach in at 8:40 a.m. and out at 9:00 a.m. with the problem solved. Dead center of the tire was an embedded self-tapping screw. RVs seem to be rolling magnets for those things. They pulled it, repaired the leak and all is well. Here is the kicker: total cost $15.00. I had to have the guy repeat that to make sure I was hearing that right. Sure beats $150 for a heavy duty jack from Northern Freight, $29.99 for a Kiddie pool, $8.00 for a bottle of Goo Gone, 2 hours of my time and $500 for a trip to the emergency room for a severed thumb. 🙂

About winnebago70x

Between the two of us, we are proud parents, Texans, Texas Exes, long distance runners, cyclists, adventurers, a guitar player, a computer programmer, a great cook, a lawyer, an engineer, a physicist, etc. etc.
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