2001 F-150 Lugnut and Tom please help RE: #5

Thanks for all of your help with the location of # 5, I was a Chevy man in
my younger days so I was on the wrong side and location for # 5. Now I
changed the pack on the cylinder in question, But now it is still hit and
miss ( no pun intended). Some times it will run fine then all of a sudden it
miss-fires again. My little scanner is telling me "IGNITION COIL C
PRIMARY/SECONDARY CIRCUIT MALFUNCTION" What the hell does that mean and how
do I fix it ?

Thanks
P.S. what ever happened to the days when you could do all of this without a
computer and scanner ?



Oh ya it might help if I tell you that my odometer reading ( digital ) is
slow in coming on. Some times it's 10 - 15 minutes after you start the truck
before it lights up. It has done this for 2 years now and I never thought it
was a big problem. I wonder if it has any connection with the miss-fire
problem ?

First... the odo reading.... is it blank and then comes on or does it
display dashes at first and then numbers after a while?

Your ignition concern... might be a little easier if we had the code rather
than your scan tools interpretation of it... I have access to the factory
PC/ED even at home. However, it is indicating an electrical concern.
Possibly spark plug cable or a primary (12V) circuit concern.... I would try
the plug cables as a first thought (you can check the resistance/continuity
of the cables and inspect the insulation for damage/bulges/lightning strikes
(it has new plugs, right? And, at the risk of drawing ire, I use only
Motorcraft plugs in Fords.... ). If these are the factory plug cables, I'd
consider replacing them since they are near or past their expected service
life...