Thanks Jim. It suddenly started doing it, but the CVH has never been the 
smoothest of engines. It gets better as the engine warms up, but the idle 
revs have always been too fast ( approx. 1200 rpm) when warm
Jimt

On Sunday, 15 October 2017 17:08:35 UTC+1, Jim Turner wrote:

> Hi All
> Can anyone tell me which is the correct OBD port on a 1600 CVH EFi loom. 
> There appears to be two, one black & one white, both with red caps.
> Also does anyone know of an interface or programme to give a readout on a 
> computer instead of the Gunson reader which relies on counting flashes on a 
> LED (which I have)
> My H4i is misfiring between 2500 & 3500 rpm when cold, with sooty plugs. 
> Any suggestions welcome. 
> Regards
> Jimt
>

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