help with missfire
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
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From: MI
Sounds like a coil pack short.
Packs are interchangeable, so swap from one side to the other to determine a coil problem.
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Junior Member
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Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
Likes: 19
From: MI
Probably just a bad mount/connection on 3.
Junior Member
Joined: Feb 2013
Posts: 5
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It could be even multiple coil packs bad. On my 4.6 I had to do 3 of them with in a coulple week's even if it only says that one cylinder. Another way to test the coil backs is to have someone put it on drive hold the break to about 2 grand when it starts to skip and unplug the coil packs one at a time. If u unplug one and the motor doesn't change as in pick up more skip then that's the bad pack. It's just a common thing with these motors. This technique may be dangerous but works.
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
Likes: 19
From: MI
It could be even multiple coil packs bad. On my 4.6 I had to do 3 of them with in a coulple week's even if it only says that one cylinder. Another way to test the coil backs is to have someone put it on drive hold the break to about 2 grand when it starts to skip and unplug the coil packs one at a time. If u unplug one and the motor doesn't change as in pick up more skip then that's the bad pack. It's just a common thing with these motors. This technique may be dangerous but works.
Junior Member
Joined: Feb 2013
Posts: 5
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There should be individual coils on each plug also that go bad frequently. There is one per cylinder, should be I thing a number 10 socket to take its one bolt out. I will post an advance auto link of msd ones that will show what I mean.