There's a big clue in what you say...
Quote:
Originally Posted by
yammy fan
since then the engine management light flickered on and off intermittently but not consistently, although maybe when under acceleration.
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It is almost certainly a loose connection/poor contact on one of the FI sensors. Now I, and a few others have expoerienced something similar which was down to an iffy connection between the Kev Mod and the IAT sensor. Check the connector block and make sure all four terminals are making good contact, if you soldered it into the wire, then check your joints.
Usually if this happens you get a error code 22. Try turning the ignition on and seeing if you get the light up. If not. Try wiggling the connector for the Kev Mod, see if it comes on.
When my Z showed this issue, just like yours it came on when accelerating at first as the inertia was just enough to break the connection. Eventually it did it all the time and showed an error 22.
Now, it could be another sensor, but the IAT/Kev Mod connector is where I'd start. After that I think I'd be inclined to check all the other connectors.
There is a slight chance that it could be the regulator/rectifier unit (or more likely its plug) that's failed/failing. This might explain your lack of headlight(s). Is the bike charging? Have a look in the reg/rec plug - are the terminals in good nick? It was a common fault on early 2008/9 Teneres, not heard of it on an X, but worth a check?
Anyway, hopefully that's given you something to investigate...