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spark plug gap
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  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 Performance
    At 50k miles. I replaced the OEM spark plugs (that I believe were original) with the one-step colder NGK plugs, gapped to .025-.026. The motor seems to run smoothly, maybe more smoothly than before, but I notice that the throttle response doesn't feel the same. Power used to be pretty much...
  3. Focus ST Maintenance
    I took an hour and a half drive on a freeway and noticed I racked up 257 misfires, which were consistently spread out throughout the drive. What’s going on? Does this matter? And how can I fix this?
  4. Focus ST Maintenance
    So today I took my car to get the plugs regapped. It’s a 2014 with 65k and the plugs are NGK iridium with 15k on them. Everything seemed fine, they had spaced out a bit but nothing further than .030”. Anyway I get in the car after they’re done, and as soon as I hit boost in 2nd gear hear a...
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