New here and needing help!
Thread Starter
Junior Member
Joined: Mar 2014
Posts: 2
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New here and needing help!
Hello all.
I have a 1999 f150 XLT, 4x2 with a Triton 5.4. Yesterday, the truck started misfiring. I had EGR and DPFE codes previously, so that was my first guess. I replaced both to no avail. The part store pulled the codes for me, and showed a "Cylinder 8 Misfire" code. This truck has been through 3 different COPs previously, so that was my first thought. I bought a new coil pack and attempted to replace the bad one. Old coil pack came off with no problem, but I can't seem to get the new one to seat on the spark plug, at least it doesn't feel like it is. When I Insert it as far as I can, there is still roughly 1" to go before it sits flush. I read online elsewhere to just tighten the screw and let the coil pack seat itself. I tried that, and the truck still misfires. I've attempted to seat the new coil multiple times, but can't get it in any further. Any other post or video I find conveniently leaves out the installation of the new coil. Has anyone had any firsthand experience with these COPs? How do I get it to seat properly? Any and all help is appreciated!
I have a 1999 f150 XLT, 4x2 with a Triton 5.4. Yesterday, the truck started misfiring. I had EGR and DPFE codes previously, so that was my first guess. I replaced both to no avail. The part store pulled the codes for me, and showed a "Cylinder 8 Misfire" code. This truck has been through 3 different COPs previously, so that was my first thought. I bought a new coil pack and attempted to replace the bad one. Old coil pack came off with no problem, but I can't seem to get the new one to seat on the spark plug, at least it doesn't feel like it is. When I Insert it as far as I can, there is still roughly 1" to go before it sits flush. I read online elsewhere to just tighten the screw and let the coil pack seat itself. I tried that, and the truck still misfires. I've attempted to seat the new coil multiple times, but can't get it in any further. Any other post or video I find conveniently leaves out the installation of the new coil. Has anyone had any firsthand experience with these COPs? How do I get it to seat properly? Any and all help is appreciated!
Senior Member
Joined: Jan 2013
Posts: 3,657
Likes: 1,029
From: KY.
Did all of the old boot come out? If so, check for debris in the spark plug well. Sometimes the new boots can fold to where they are not on the plug correctly. Something is holding it up though.
Last edited by JCR 56; Mar 21, 2014 at 05:30 PM.
Thread Starter
Junior Member
Joined: Mar 2014
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It is the right boot and spring, and its clean down around the plug. Its the #8 cylinder, so its tough to get the new coil to come directly down on top of the plug. I really want to avoid removing other things if I can.
Senior Member
Joined: Sep 2013
Posts: 261
Likes: 22
From: VA
Well something is wrong.... Either the coil pack is wrong, or the bot and spring are wrong, or part of the old boot is stuck on the spark plug... or you just aren't putting it on properly.
Nothing has changed about the depth of your spark plug tube since removing the old one, so something about your new part, or your technique has to be wrong. You can spray a little silicone spray on the boot to help it slide in, and also make sure it is angled properly
Nothing has changed about the depth of your spark plug tube since removing the old one, so something about your new part, or your technique has to be wrong. You can spray a little silicone spray on the boot to help it slide in, and also make sure it is angled properly