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Discussion Starter · #1 ·
have 1999 roadking with efi. spark plugs carbon up right away. put plugs into another bike and test ok. put into roadking and plugs get carboned up right away. should module be replaced or any other suggestions would be appreciated without going to shop. thank you.
 

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If they both carbon up, ie both cylinders run rich equally, it is likely a sensor or a bad map, in particular if the check engine lite shows no codes, ie unusual attitude.
While there are many possible causes, if the flash in the ECM is stock and the bike retains more or less normal performance and normal cold start characteristics, the first suspect would be the engine temp sensor on the front head.
 
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