http://www.gunson.co.uk/item.aspx?cat=673&item=1822

Have used one on many engines although not on a zetec.

Gary

On 23/10/2010 22:56, michaelhughe...@aol.com wrote:
In case you run out of luck Gunson used to sell a gadget which was a special spark plug with a transparent bowl which enabled you to see the colour of the burning air fuel charge. A bit like adjusting a basic bunsen burner in a lab it had a colour chart so that you could judge the effect of your adjustments to the mixture visually. I don't know if it is still available or if they had one that fits Fiesta size spark plug holes and threads
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