Random Rough Running - GL1800Riders
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  • 1 Post By CHICO
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post #1 of 10 (permalink) Old 03-30-2017, 01:04 PM Thread Starter
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Random Rough Running

Greetings fellow Wingers,

Lately my 03 Wing will occasionally begin running rough while cruising along, resembling an intermittent fuel flow or possible misfiring. This will happen randomly, not everytime, and will continue for about 10 - 15 seconds. Then all will be ok. Sometimes it will happen once or twice during a ride. Other times, no symptoms during the ride. When it is happening, there are no fault indicators showing.

Just the other day while out riding, I stopped for about 15 minutes to do some shopping. When I fired her up again, it immediately ran rough for about the same period of time, then all was ok.

What do you think?
Thanks
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post #2 of 10 (permalink) Old 03-30-2017, 01:26 PM
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Check your air filter. Guy I know had similar issue and had a mouse living in air cleaner. It ended up damaging a sensor or something underneath.
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post #3 of 10 (permalink) Old 03-30-2017, 01:35 PM Thread Starter
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Thanks for the feedback.
The air filter is relatively new and there is no mouse in the house.
And, it would seem if it was the air filter, the problem would not be random or intermittent?
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post #4 of 10 (permalink) Old 03-30-2017, 01:50 PM
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Random Rough Running

Could be fuel and a dose of injector cleaner may help.

However, I would guess an '03 might be showing intermittent spark loss from aged coil(s) or plug wires.

I would start by getting a IR temp gun and checking exhaust header temps at idle. Bad wire or coil will show much lower temps on a pair of cylinders.

Later, when not typing on a phone, I'll throw up a link to a thread where @Fred H. shows his diagnosis process on @Glockjock Wing. That might help you trace your issue before the money for unneeded parts starts being spent.
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post #5 of 10 (permalink) Old 03-30-2017, 02:06 PM Thread Starter
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Ironhorse 1800,

Good ideas. Thanks for the feedback.
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post #6 of 10 (permalink) Old 03-30-2017, 03:40 PM
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My '06 did the exact same thing after I overfilled the tank from the auxiliary tank. I thought over time it would evaporate from the evap canister, but it did not completely dry out. Every time the purge valve would open the bike would run so rich that it bucked and snorted something terrible until the valve closed. Replaced the evap canister and all is well.

If you fill close to the top and then hit just the right big bump, it can slosh fuel into the evap line which usually only has to handle vapor.

Anyway, just another idea.
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post #7 of 10 (permalink) Old 03-30-2017, 07:14 PM
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Remembering this thread is why I suggest testing exhaust header temps as a first stab at it.

New coils and plug wires make a difference

Since one coil and a pair of wires fire plugs for a pair of cylinders, issues in either wire or that coil can, and I suspect usually do, show low temps for BOTH cylinders.

Considering age, if it is determined that you need a coil or a couple of plug wires, I would bite the bullet and replace all 3 coils and all 6 wires while in there.

But ... don't go ordering parts just yet based on my WAG!


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post #8 of 10 (permalink) Old 03-30-2017, 07:22 PM
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I had a similar experience and it turned out to be a small amount of water in the gas tank.. I added some alcohol to the tank to take up the water and the studded went away in just a 1/4 tank of gas..
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post #9 of 10 (permalink) Old 03-30-2017, 07:44 PM
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I wonder about being able to get it on video and post it here. It could be a lot help to others too. I use my IR temp gun on plug wires on my old bikes, I don't see why it wouldn't work on the newer ones too. This of course along with temps checks on header pipes too.

Other questions that haven't been answered so far are: state of spark plugs and valve clearance.
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post #10 of 10 (permalink) Old 03-30-2017, 07:56 PM
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Ironhorse in post 7 beats me to my WAG, fault in high tension side of ignition.

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