Nozzle....Squirter.. all the same. Open the hood and you should be able to get your hand thru the underside ribbing of the hood. Just leave the hose attached to the squirter unless it makes it too hard to get your hand in. You will feel on the underside of the squirter two little plastic tabs. Squeeze those inward and the little squirter will pop up and free of the hood. Then you can get some silicon under it and then just snap it back in. Some silicon will seep out around the edges ....just leave it and when it cures just pick it off.....

 

Thread like this is what make all sense of Internet. Have exactly same problem of misfire in #1,2 after rain. Did some taping between cowl seal and fire wall but didn't help. Today open hood slowly and saw a drip from nozzle hole at passenger side. Exactly same puddle at same place like Spotty truck had - ribbed wire. Will fix it with first dry weather. Thanks Spotty. Did that silicone around nozzle fix yours problem?

 

I see you have found one solution I have a 5.4 03 F-150 & a 4.6 05 Explorer that were getting water in 3, 4, 7 or 8 Plug. Looked at the Spray Nozzles was not convinced, I took a water hose and ran water over the rear of the Hood with it closed and all four plugs were very wet. Next I left the hood open and ran a little water down the windshield here it came right on the plugs. It was leaking in where the little grill between the Hood and Windshield clips snap in behind the hood the original seals were Deteriorated. There were about six leaking only two on the plugs I made seals for the two clips over the plugs. Then tried the hose again and no water on the plugs. The other four continue to leak with no with no visible impact.

 

Just to confirm that it was it. Did what OP did, put silicone around spray nozzles. Truck is running like a champ again.

 

Glad you got her..

 

Had same problem again. Silicone didn't hold to long. This time I cover nozzles from top with flashing tape. Now much better after rain. I add this time a lot silicone grease around spark plug boots nr 1 and 3(not 2 evidentially). I have that brown mark at boot 3 and little at boot 1. Will let you know if silicone grease help (I just add it today). It was much better with adding flashing tape but I hope with add of grease around boots will be good. It is design flaw of Ford. Well should be higher then surrounding so water can not sink in.

 

I don't know about most of you folks but I consider time as money so lets fix the problem. Below is the part number and retail price of the Washer Nozzle. Also you should be using Di-Electric Compound around Plug boots, Inside boots and on any connectors involved. Now that you have the grease put it in any connector you take apart it improves the connection as well it will keep water out.


<table id="ResultsTable" border="0" cellspacing="0" cellpadding="0"><tbody><tr class="Item"><td rowspan="2"> </td><td rowspan="2">
19A331 (WA- 10)

</td><td class="NoBorder" style="width: 100%;" rowspan="1"> Silicone Di-Electric Compound
(Special Products Usa Usage); Silicone Dielectric Compound - for distributor rotor tip and Duraspark ignition cables - 3 oz. tube
</td><td class="NoBorder" rowspan="1"> $14.37</td></tr></tbody></table>



<table class="ViewIllustrationParts" style="width: 499px; height: 107px;" cellspacing="0" cellpadding="0"><tbody><tr><th style="width: 18%;">Part Number</th><th style="width: 26%;">Part Description</th><th style="width: 9%;"> Price</th><th style="width: 9%;"></th><th style="width: 14%;"> </th><th style="width: 24%;"></th></tr><tr><td>17603


</td><td>Window Washer Nozzle
windshield
</td><td> $10.27</td></tr></tbody></table>

 

I solved problem finally. It was bad spark plug wire at nr 2. I figured out it is wire when wire detached from boot when I tried to pull boot out of nr 2. It confused me because it show up like misfire only after rain.
As I post this for someone who my Google looking for solution for same problem. I had P0302 all time on off during last 1 year of fighting with this. Checked code in code reader. It is definitely P0302 and cylinder is nr 2 not 3 (passenger second from front)
Edit again. One big ting I did wrong. I looked for spark in night at random time. You have to check after rain in night or wet weather. There wasn't spark when I did look for because it was dry. When I pull out wire with hand I managed to press it in boot again and drive home. I had only intermittent misses. That night at home, even if was dry weather I saw spark every like 10s and heard that snapping noise.

 

See my Post 12/21/2014 in this group.

 

I did waterproof grille etc thanks to yours and other posts in this tread. It helped but had misfires still always. Before waterproofing would have misfire at 2-3 cylinders after rein. After waterproofing problem stay only nr 2. Will be rain at Wednesday for final verdict.

 

I have had so many problems with water down the spark plug holes I would never wash my 5.4. I put a mini eavestrough across the motor to keep the rain out. New rubber hood seal. Siliconed the crack down the centre of plastic at the fire wall hood area where the rubber seal fits. Now the cross pipe below the thermostat is leaking and yea the antifreeze is going down the spak plugs. Oh and buy the way ford put the one bolt in from the bottom up so the hole intake has to be removed, Great truck for short trips with 20,000 lbs on a trailer but hates water.

 

Well when this tread is bumped and I get notice in windows10. Replaces spark plug wires and never had to look back. How I figure it is spark plug wires? One virtually stay in my hand when I checked it.