The Focus is now up to about 55k miles. I went to Le mans last week for the 24h and on the way the EML came on and it started misfiring. Getting to LM was more important than the car, which really has little actual value, so I ploughed on. After unrelated flat battery and puncture "issues" I am loving it even less but I should try to fix it if I can do it cheaply. So I'm trying to go through some diagnostic steps rather than putting it with a garage to carry out the same at much higher cost.
A mate had a thing to read the codes and it told us misfire in cylinder 4.
So far I have replaced cyl4 spark plus, and now the coil. I am about to replace the remaining three plugs, then will change the cables if that still isn't working, but what after that?
I suspect I have ruined the cat with 500 miles or so under Yellow Flag but that wouldn't actually CAUSE the misfire would it? If not, what else could be the cause?
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Ford Focus II - Focus 2006 1.6L engine m.. new
Ford Focus II - Focus 2006 1.6L engine m.. new