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Fiesta ST Spark plug tech

westcoaST

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that good to hear, bet your relieved to see that! Are the positive corrections your seeing more consistent now across all 4 cylinders with these cooler plugs and narrower gap?
Yeah, definitely. Now we can turn the boost up further
 


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Hmmm, I thought that was the size I used. I know it needed to be a thin walled socket. I'll take look later tonight.
 


westcoaST

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I had to buy a thin wall, extended length socket. I got it from KD tools through Amazon. Standard 5/8 sockets are too thick and too short.
 


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I was having problem with inconsistent corrections across all 4 cylinders and the Densos have seemed to cleaned that up.
 


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Does anybody have the torque specifications for the spark plugs? I know the general rule for tightening plugs, but I just like the reassurance of tightening things to there spec.
 


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Sorry to reopen this old thread. I'm getting ready to change my plugs. Has there been any updates on the spark plug front? Has a 1-step colder plug, with the stock reach into the cylinder, plug been found?
 


alexrex20

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If you buy the "generics" they do not come pre-gapped. I would get the NGKs over the Densos. I got my NGKs from AutoZone, using the generic part number. I believe it cross references to the Cadillac ATS with the turbo 4cyl. You can either buy these pre-gapped from a vendor like Whoosh or Tune+ or Stratified, or gap them yourself. They do not come pre-gapped if you buy them as generics (e.g on Amazon or VatoZone or O'Reillys, etc).
 


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Changed the stockers for the NGKs, Today. 76k miles, and were gapped at .032. I dont think they look bad. But, I've never quite gotten into reading plugs. The NGKs, I gapped to .026. May be placebo, but, everything feels smoother. Over 50k of those miles are Stg 1 tuned by Cobb and Stratified. Wondering if the intermittent hesitation when accelerating was caused by the stockers being gapped so wide. Time will tell...
 


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