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Just learned that gapping spark plugs closer than factory spec actually helped my turbo 3.5
I kept getting misfire codes on my EcoBoost after installing bigger turbos and trying to push more boost. After three trips to forums and a chat with a local tuner in Phoenix, he said to gap them down to 0.028 instead of the stock 0.032. I pulled the plugs Saturday, regapped them all with a feeler gauge, and the truck pulled clean through 5,000 RPM without a hiccup. Has anyone else experimented with tighter gaps on high boost setups?
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the_laura17h ago
Tighter gaps are pretty standard once you push boost past a certain point. 0.028 is where my tuner had me set mine on my Focus ST after going to a GTX2867. No more blowout at 25 psi.
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dakotawood16h ago
Guess I should stop filing my spark plugs to 0.030 then.
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