Misfire problem every 4k-6k miles | Ford Explorer Forums - Serious Explorations

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Misfire problem every 4k-6k miles

rsilva708

Member
Joined
January 26, 2005
Messages
39
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0
City, State
Hickory Hills, IL
Year, Model & Trim Level
2000 XLT
I have a cly 4 misfire problem. It happens every 4000 - 6000 miles, and my explorer will start to miss, and then throw a cly 4 mis code. When I pull the plug it will always have a hairline crack. Change the plug and the problem is gone till another 4000-6000 miles. I have included pics of the last two plugs I have changed. The plugs are Autolite APP 103 Double plat.

2000 XLT 4.0 OHV

plug41.jpg

plug42.jpg

plug43.jpg
 






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