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misfires

  1. Focus ST Maintenance
    Some of you may be familiar with the TSB for cold start misfire CEL. The TSB calls for Fiesta spark plugs, gapped at .040, and some software update that as I understand it slightly retards timing. It worked well for me, the CEL went away and never came back. But now that I'm ready for new plugs...
  2. Focus ST Discussions
    I have a 2015 ST3 and my first year of owning it I had no problems. Then I randomly get a misfire code for on of the cylinders. I reset the codes to see if it would happen again and it didn’t come back for a couple months. Also every time I do get the code it’s not always the same cylinder...
  3. Focus ST Maintenance
    I am under warranty but stationed overseas. My 2016 focus st is misfiring in cylinder 2 (302 code). I put in new plugs(gapped correctly, NGKs 1step colder first, changed to densos 5 days ago), checked coil packs (good), measured resistance on all 4 injectors( good), and performed a compression...
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