#5 Misfire """HELP"""

[01_HD_F-150]

It has been a long time since I have been on the forum. I have a 2001 non SC of course. I got it in 2004 with only 10,000 miles. It now has 189,000 miles. I have not had any major problems with it over the years. Recently my number 5 cylinder started to misfire. I am out of ideas. I have replaced the spark plug, the coil, and the injector. It is also holding steady vacuum. I want to do a compression test but don't have the tools here with me. I have searched through post and threads and I am out of ideas.

[Massive1]

Have you checked the connection plug to the coil. I had the same problem with my 02. The plugs won't click and come a bit loose some times

[Braker85]

What brand of COP did you buy? Like mentioned above make sure you have a solid connection to the plug? Have you used any die electric grease? Do you have the proper voltage to the COP? Do you have any voltage at all??