My wife has very low mileage Fiesta 1.25 Zeetec. Owned for 2 years,It was purchased from a local car dealer who serviced it before purchase. New spark plugs were fitted at the service.
After 2 years and only 4,000 miles I decieded to check the spark plug gaps, the owners manual states spark plug type AYFS 22C gap 1.3mm
The Spark plugs gaps were set at 40 thou, I calculated 1.3mm as 50 thou which did appear to be a large gap..........but I reset them all to 50.
After 2 tankfulls of fuel I suspect the MPG has dropped by 10%
Are there any ford mechanics that can advise me please ? should I leave them at 50 or reset them to a smaller gap ?? thank you
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