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Nik
Posted on Sunday, July 30, 2017 - 12:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Since May I've been battling an intermittent electrical issue. The bike has 80k miles on it and I'd like to get to 100k, but this is shaking my confidence for taking it on longer trips.

It manifests itself as the tach going crazy jumping around, or dying and resting at 0 rpm. Sometimes that's all there is to it, but sometimes the bike looses power, like a skip spark condition. When this happens the CEL comes on intermittently. When checking later there's a code 13 (o2).

So far I've replaced the o2 sensor, cleaned all the grounds, checked the harness for shorts, cleaned the ECM connections and replaced the seals on the connectors. Frustratingly each of these fixes appears to fix the problem, until it pops back up. Perhaps temperature is a trigger?

Next I'm going to replace the coil and wires. But blindingly replacing parts could quickly lead to a new ECM and harness, which might not even fix the problem. Has anyone experienced something similar? Any leads?
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Akbuell
Posted on Monday, July 31, 2017 - 01:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Not a fan of blindingly replacing parts either.

Temperature could be a trigger. IIRC, the tach, which seems to be the primary symptom, gets its info from the CPS. If the CPS or its associated wiring is in a pre-fail mode, that could be the issue. That would cause a tach indicator failure and loss of power. And a 'corrupted' signal from the CPS could cause the ECM to throw an 02 (or other) sensor code.

And all of the above is out the window if the instrument cluster/headlight/ign switch assemblies have a weak or intermittent ground. I believe there are ground points in that area, or ground through the frame from a portion of the harness that runs along side the steering stem.

Hope this helps, Dave
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Mmcn49
Posted on Sunday, August 06, 2017 - 07:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Coils seldom fail. The stock plug wires are carbon suppression which break down with use and age. At 80K you're probably past due.

Had a somewhat similar issue with my almost new TT. Somehow during assembly insulation on a plug wire was sliced right down to the conductor.

When it was damp, all kinds of irritating things happened. Bike was under warranty but the dealer nitwits found nothing. Getting desperate I started pulling stuff and inspecting. found the sliced wire a couple hours into it.
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