Sounds like something else got mucked up when you installed the colortune
plug. I can't see how that would affect the comeplete ignition circuit. Even
if the colortune was shorted out that cylinder would be the only one not to
fire.
Mike
'79B
----- Original Message -----
From: <Timfboston@aol.com>
To: <mgs@autox.team.net>
Sent: Friday, April 22, 2005 11:35 AM
Subject: Gunson Colour Tune
>I have used my colour tune spark plug for tune ups for years with great
>results. I tried it yesterday and when I tried to start my '71 MGB with it
>yesterday, it was as if the battery was drained and would not turn the
>engine. Put the real spark plug back in and starts right up. Any ideas?
>
> Thank you,
>
> Tim
> 1971 BRG MGB
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