Ignition coil rain problems

I drive a 2001 F-150 and I've had to replace ignition coils three times after a rain. It's raining now, the truck's running rough and I'm gonna have to do it again. I know this is an ongoing problem with Ford, my question is, is there a fix for it? Can I use some kind of rain guard over the hood vents? Would that be a waste of time and money? I'm not looking for something pretty, just practical. Thank's much.

I had to design a rain diverter for my cowl, see www.automotiveforums.com/vbulletin/showthread.php?t=893556 (http://www.automotiveforums.com/vbulletin/showthread.php?t=893556)

Try using CRC electronic cleaner to clean contaminated COP's instead of new COP's.

THAT is a good idea. Plus, I get to take another trip to Home Depot. Thanks.

Pay close attention to the tube that wraps around the spark plug. Cracks can allow voltage to jump to ground causing a misfire. The spark plug terminal should also fit tightly.
If a COP coil tests bad and is replaced, future problems can often be avoided by cleaning the COP connector and wiring harness terminals. Corrosion at either place can cause intermittent operation and loss of continuity, which may contribute to component failure. Applying dielectric grease to these connections can help prevent corrosion and assure a good electrical connection.

So what exactly happens here? Does the rain get under the boot and short the secondary on the coil?

Water would pool in the spark plug boss, short the ignition signal out, causing the misfire.

When the engine gets hot, the spark plug boss pool water would evaporate, the only evidence is a little rust on the COP boot.

Interesting.