When to replace spark plugs?
12-01-2015, 01:20 PM
#1
Senior Member
Thread Starter
When to replace spark plugs?
2014 5.0, mainly run 93 octane with mpt street performance tune, kn cai, long tube headers and exhaust. Wondering how often I should change the plugs with these minor mods? Thanks
12-01-2015, 01:21 PM
#2
Ask these guys. https://www.f150forum.com/f38/ But the change interval is probably the same as without the mods unless you're actually driving the living hell out of the truck, more than regular average joe usage, on a daily basis.
12-02-2015, 09:11 AM
#4
Yes. Avoid them. Use Motorcraft.
12-02-2015, 11:16 AM
#5
Gone Golfin
iTrader: (3)
12-02-2015, 11:18 AM
#6
It's not a matter of avoiding the specific brand. It's a matter of avoiding not using Motorcraft. In every year group on this forum, I read nothing but bad results from folks using anything but MC plugs. So why not? Besides, a plug is a plug. It makes a spark and the spark is hot, it qualifies. So, no reason to stray from the plug that the manufacturer designed specifically for your engine.
Last edited by Martian; 12-02-2015 at 11:53 AM.
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12-02-2015, 02:27 PM
#8
F150 Forum
We personally recommend to use the Motorcraft factory replacement plugs and to change them around 30,000 miles on performance tuned / modded vehicles. The first set of plugs we really prefer to make sure customers change out by 20-30,000 miles as well since they were the initial break in set while the rings were seating fully. This helps to ensure optimal performance and fuel economy as well.
Be sure to gap them properly also when installing. The latest Motorcraft plugs normally state they are pre-adjusted on the box and say they are not to be adjusted. The issue there lies in the fact that the plugs are normally different gap from one to the next and on most performance vehicles we tighten the gap slightly as well to prevent any potential for spark blow out / flame out. This is especially important on the other models such as the factory forced induction vehicles like EcoBoost trucks which we gap @ .030"
Be sure to gap them properly also when installing. The latest Motorcraft plugs normally state they are pre-adjusted on the box and say they are not to be adjusted. The issue there lies in the fact that the plugs are normally different gap from one to the next and on most performance vehicles we tighten the gap slightly as well to prevent any potential for spark blow out / flame out. This is especially important on the other models such as the factory forced induction vehicles like EcoBoost trucks which we gap @ .030"
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