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2020 V85TT CEL after/during heavy rain

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Grabcon:
I have a 2020 V85TT with 33k miles, I bought the bike with 3200 miles on the clock, owner two years now. The bike runs great most of the time, 99%. But in the last 17k miles or so I have had an issue during heavy rain and after. I live in SE Arizona so I don’t get a lot of rain and if I do I won’t ride unless I am already out and about. So this issue only happens on trips.

The problem is that I will get a CEL while riding, sometimes the bike will have a significant misfire and always in an uphill direction. Sometimes the bike has sat in the rain because we were traveling and it may have been parked for the evening, then when we start out the next day I might get the CEL after some miles, don’t know how many it is random. Sometimes the CEL will go out on its own other times I will need to check and clear codes. Codes always show as an O2 sensor.  Early on I pulled the sensors and tested and they test fine. After a tank of gas or so the intermittent misfire will stop.

My original thought is that it might be an electrical connection issue, I have pulled the tank and got thru all connections cleaning and reseating. It still happens. This last weekend I went on a 1300 mile trip and hit heavy rain 10 miles from destination so 650 miles in the trip. The CEL lite up but no misfire. The bike sat for three days and we had heavy rain on and off for those days. We packed up and left started the bike and no CEL and sunshine. Filled up and went 30 or 40 miles and the CEL came on along with the misfire. Again random misfire always uphill. This went on for 200 miles. CEL on the whole way, did another fill, misfire lessened but still there. CEL didn’t go out. Got to the motel for the night and disconnected the battery overnight. As a note when the misfire happens the onboard computer AVG Miles MPG drops into the teens From whatever it  was reading. Misfire stops MPG goes back up.

Reconnected the battery in the morning, did a fill rode 335 miles with a second fill midway. No issues.

So the questions is “Am I getting water in the tank when it rains?” IF so how, “is the cap leaking?” I am at a loss as to what cause the issue.

Any constructive thoughts would be good.

guzzisteve:
Plug the bike in when light is on to find out what goes on. Plug into software to tell you. It's the way it's made, or look at info on dash for codes.

Dirk_S:
Can you unplug the Lambda sensors temporarily to see if the code pops up again?

rocker59:

1) I would be concerned about water contaminating the fuel.  Next time you park it out overnight in the rain, cover the bike.  Bike covers are not expensive.  I always carry one when on long trips.  Keeps prying eyes away from the bike, and keeps the bike dry in the event of overnight monsoon rains.

2) make sure your plug wires are good, and are not being fouled by the heavy rain.

kingoffleece:
+1.  I always bring a half cover with me on trips.
If you need a dealer Matt at ManicMoto in Queen Creek is very good.

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