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 ?
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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...
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The odo reading only comes on straight from blank it does not show dashes first
The truck has no plug wires it only has individual coil packs the truck has 200,000 kilometres on it ( about 130,000 miles ). I have had coil pack problems before and changed them with no problems after, so this issue has me puzzled.

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My bad... it was around the 00/01 MY that the 4.6 was changed from coil packs to coil on plug.... There is much to be lost in terminology.
Now... have the plugs been changed... if so, what with?
As for the odo display... if the display came on with dashes at first, it would have indicated a communications problem between the cluster and the PCM. Since the display is blank at first, it is a sign of impending doom for the cluster itself.
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On Sun, 13 Jan 2008 18:25:34 -0500, "Sue Milbury"

I agree with Jim. The exact code would be helpful. If I recall correctly, the PCM can detect a misfire whether it be electrical or fuel. The codes would be different. I also think you may have a plug problem. That is the most common problem other than the COP packs. I strongly recommend using nothing but Motorcraft plugs in Fords. They are readily available in most areas at competitive prices. In the absence of Motorcraft, I have had good luck with Autolite plugs in Fords. If you have Bosch plugs installed, I would pull every one of them before you get any more grief. I have no idea how an otherwise quality manufacturer can build such crappy junk spark plugs to tarnish their reputation. Never installed a set in anything that didn't result in problems.
Lugnut
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