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Eco spark plug gap

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Old 09-02-2012, 11:31 PM   #101
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Quite possibly. I've heard many stories of forced induction blowing the spark out if the gap is too wide.

I'd start conservatively, then work up as required. Try the maximum recommended pressure and see how the engine responds.
It isn't so much that it is snuffed out, but it fails to fire at all. Increased cylinder pressure requires a higher voltage to arc, as does a larger gap. So short of increasing the primary voltage or finding a hotter aftermarket coil (and good luck finding a good quality aftermarket COP) adjusting the gap to a point where the factory system can still function is the only option.
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Old 09-03-2012, 12:00 AM   #102
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A much better description, thank you.
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Old 09-03-2012, 12:18 AM   #103
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So, could this be a possible reason why some 5.0's are experiencing a shudder as well? Their gaps are off also?
Should we point it out or keep it to ourselves and let them figure it out? ;-)
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Old 09-03-2012, 04:33 PM   #104
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I wish I had ckeck my plugs sooner. Since I have change plug gap no more shudder or misfire when I hammer it.
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Old 09-03-2012, 05:16 PM   #105
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Just did mine today. they ranged from .025 all the way up to .042...havent driven it since but it did seem to idle smoother. hopefully gas mileage improves.
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Old 09-03-2012, 05:24 PM   #106
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Just did mine today. they ranged from .025 all the way up to .042...havent driven it since but it did seem to idle smoother. hopefully gas mileage improves.
WOW WTF. Seem to idle smoother? I'd say so.
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Old 09-03-2012, 05:58 PM   #107
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I can't believe the variations of something that is so easy to do correctly. Someone at Ford needs to have their *** kicked. When the weather cools down a little I'm going to check mine.
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Old 09-03-2012, 06:43 PM   #108
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Just did mine today. they ranged from .025 all the way up to .042...havent driven it since but it did seem to idle smoother. hopefully gas mileage improves.
Wow!
So did you have any power loss issues and the 55 shudder?
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Old 09-03-2012, 06:45 PM   #109
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Originally Posted by alpo
I can't believe the variations of something that is so easy to do correctly. Someone at Ford needs to have their *** kicked. When the weather cools down a little I'm going to check mine.
You had asked in the 5* thread about gap with tuners. Most are running .030
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Old 09-03-2012, 07:33 PM   #110
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You had asked in the 5* thread about gap with tuners. Most are running .030
Hedging my bets....

Is there any rationale behind .030? I like to run the gap as big as practical.
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