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Cylinder 7 Misfire

Old 10-17-2018, 09:42 AM
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Default Cylinder 7 Misfire

I just recently swapped out all of my coils (last week) after cylinder 7 began to misfire. It worked for about a week and then yesterday it started misfiring again. My next step is changing the plug. However, I did notice that the clip for the fuel injector connector is broken. It stays on but comes off easily. I seated really good but it still misfired. I have two questions: could that connector be the issue? what are the chances I have a bad coil right out of the box? I will be changing the plug and repairing the clip regardless.

2007 F150
171,000 miles
4.6l
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Old 10-17-2018, 10:03 AM
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I would of changed the plug first in # 7... You can always swap COP's #6 and #7 and see if the DTC follows.
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Old 10-17-2018, 12:38 PM
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What tech said, swap coils for 6 - 7 and see if the misfire goes to 6. Then you know it's the coil. If you're not careful when doing coils you can cause a misfire with the dielectric grease or dirt. I dislike coils that come with dielectric grease packed in the boots. I like to do my own dielectric grease and use only enough. Everyone Ive seen out of the box has WAY too much grease in the end of the boot.
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Old 10-17-2018, 01:18 PM
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Replace that connector
Swap coils/test
Are you still on factory plugs?
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Old 10-17-2018, 01:42 PM
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Originally Posted by SCORGE View Post
Replace that connector
Swap coils/test
Are you still on factory plugs?
This is my plan.....the plugs were changed at 100,000 miles....
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Old 10-17-2018, 01:52 PM
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Originally Posted by cal516 View Post
This is my plan.....the plugs were changed at 100,000 miles....
Hell, might as well do all plugs
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Old 10-17-2018, 11:06 PM
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FYI....head gasket is leaking. The spark plug chamber was full of oil. All of the gunk built up was causing the misfire...
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Old 10-17-2018, 11:08 PM
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Originally Posted by cal516 View Post
FYI....head gasket is leaking. The spark plug chamber was full of oil. All of the gunk built up was causing the misfire...
Well ****
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Old 10-17-2018, 11:10 PM
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Probably valve cover gasket
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Old 10-17-2018, 11:41 PM
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Originally Posted by SCORGE View Post
Probably valve cover gasket
You are correct.... are those difficult to replace.
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