Electrical issue - Died, now it coughs and sputters - Road Star Warrior Forum : Yamaha Star Warrior Forums

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Old 11-10-2017, 03:16 PM   #1 (permalink)
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Default Electrical issue - Died, now it coughs and sputters

The other day I was riding to work and the Warrior coughed a bit and then died. I pulled over and it wouldn't start. It was dark out, so I couldn't see much. I took the seat off and played with the wires a bit and it started right up and rode like normal for about 1/4 mile or so and did it again. This is all within a mile or so of home. Same thing a couple more times, but now just dying without the cough. I turned around and headed back home. It did the same thing repeatedly, getting more frequent, probably 8 - 10 times before I got home. Each time it died it would not start and there was no sound from the fuel pump or LCV when the key was turned on, until I messed with the wires under the seat.

So I parked it in the garage until I could check it out in daylight. Yesterday I took it out and did a lap around the neighborhood trying to get the same issue to narrow down the problem. It didn't die at all, but now it coughs and sputters, mostly around 4000 - 4500 RPMs but sometimes lower revs too.

The bike is heavily modified, and a lot of it was done before I bought it. Mostly relocated stuff and LED lights. I replaced the PCV with a Dynatek Fusion fuel controller (pretty much a PCV with ignition timing control added), and added a Dynojet AutoTuner about a year ago. The O2 sensors are unplugged now (no bungs in the new exhaust). It ran fine with the new exhaust for a couple months, so I don't think it's anything to do with that. Nothing has been done to it since I replaced the exhaust.

From the symptoms, I'm pretty sure it's a loose wire or connector somewhere, but I don't see anything obvious and it runs fine in the garage with the seat off. I'm thinking I'll take the AutoTune off since it's not functioning without the O2 sensors, but I did verify that it is not modifying the map (Trim map is all zeros).

Anyone have a good idea where to start?

Thanks,
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Old 11-10-2017, 06:02 PM   #2 (permalink)
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Could try pushing wires on LAS connector. Mine got loose once and that did it.
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Old 11-10-2017, 09:36 PM   #3 (permalink)
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wish I had an answer that would help you man. I hate electrical gremlins.
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Old 11-10-2017, 11:54 PM   #4 (permalink)
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Checking the wiring on the tuners. While running mess with the wires and see if it changes any thing.
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Old 11-11-2017, 12:24 AM   #5 (permalink)
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Check the battery and starter cables for clean, tight connections then let us know.
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Old 11-11-2017, 07:41 AM   #6 (permalink)
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Check your ground cables, there are 2, one to the chassis and one to a white connector. The latter can give grief. Also check your coil connectors and main HT cables/plugs. They are known to give similar issues.

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Old 04-26-2019, 12:00 AM   #7 (permalink)
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I just noticed I never got back on this thread and posted the fix. It was the LAS (lean angle sensor) Thanks Stretch. I just glued it in place to disable it and it's worked fine ever since. I keep meaning to get another one, but never get around to it.
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Old 04-26-2019, 08:01 AM   #8 (permalink)
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Awesome. Glad you got it.
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Old 04-30-2019, 03:04 PM   #9 (permalink)
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Fantastic news.
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Old 04-30-2019, 09:02 PM   #10 (permalink)
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Thanks for coming back and posting your results. It's always nice to find out what happened in case someone else has this problem and is looking for an answer.
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