Cylinder 7 Misfire
10-17-2018, 08:42 AM
#1
Junior Member
Thread Starter
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
2007 F150
171,000 miles
4.6l
10-17-2018, 09:03 AM
#2
Mark
iTrader: (1)
I would of changed the plug first in # 7... You can always swap COP's #6 and #7 and see if the DTC follows.
10-17-2018, 11:38 AM
#3
Moderator
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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techrep (10-17-2018)
10-17-2018, 12:18 PM
#4
Replace that connector
Swap coils/test
Are you still on factory plugs?
Swap coils/test
Are you still on factory plugs?
10-17-2018, 12:42 PM
#5
Junior Member
Thread Starter
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10-17-2018, 10:08 PM
#8
10-17-2018, 10:10 PM
#9
Probably valve cover gasket