8 plugs and 8 coils on 4.6 | Ford Explorer Forums

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8 plugs and 8 coils on 4.6

XploX

Well-Known Member
Joined
April 29, 2015
Messages
120
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23
Year, Model & Trim Level
17 All-Terrain
I just finished the plugs and coils. I can't believe how easy it is, it took about 2 hrs.
I decided to change everything since there was a misfire on #8 and it's just over 87,000 miles on the clock.
I TTA and I believe that is plenty tight to prevent a blowout. Time will tell and it runs great again.

When I pulled the #8 coil out, it was a little wet and the end had a white greasy coating. It isn't oil or antifreeze, it was just water. I think the boot allowed water to seep in and the dielectric grease oozed. The tip of the plug was rusted and this combination was the cause of the misfire.
I'll post a pic of the coil, but the white grease dried up while I was finishing the rest of the job. Now it flakes off.
The spring is sticking out because I pulled the boot off.

Here's the pic...


 






I had a misfire on #8 also and replaced it.
Also siliconed the wiper cowl clips that allowed water to leak into the engine bay.
Stupid design, IMHO.
 






The ironic part is... I replaced everything for the same cost as the dealer wanted for labor alone. And knowing dealers, they would have changed the #8 plug and replaced the coil boot and charged $500.00.
 






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