Good evening all. I researched this but wanted some opinions. I had my engine replaced last summer with a Ford Reman engine. Got a good deal. Anyways with gas the way it is I prefer to drive my Tempo back and forth to work so the truck doesn't get driven a whole lot. So I finished the brakes this morning and took it for a drive and it was running really rough, missing, back firing, etc. In the past this problem has pointed to the coil. Not this time. I tested all 10 coils and checked the plugs for wear. The engine only has 4000 miles on it, but I thought I should check anyways. So i pulled the coil on cylinder 5 and found moisture on the bottom of the boot. So I pulled the plug moisture of course on the plug. Changed the plug blew the hole out with air and truck runs fine. Whats the deal?? I read that cylinders 4 and 5 getting moisture down in the hole is a common problem being that they have coolant hoses running over them and that they are near the cowel. Is there anything else I should check for?? Truck is a 00 F-250 4x4. By the way if anyone hasn't been to the Rouge Plant in Dearborn I highly reccomend it. Went there with the wife on our 5th anniversery. Thanks in advance.

Semper FI
Larry B

 

Maybe the exhaust valve was open and u live in a real damp area..... head gasket leaked a little and shorter out the plug... cylder walls heated but no firing alowed air to cool and more mosture to build up during miss fire.

 

If you're talking about just water in the hole, but not IN the cylinder, well, nature of the beast, methinks.

Use dielectric grease around the tip of the boot where it seals to the plug, AND around the top of the boot in the seal area where the boot seals to the head. I've done it, and been moisture free on all my modulars for years.

I've had it happen to two 4.6L's, and my V10, so it's not unusual to get moisture in there...

 

when u shut the engine off and the exhaust valve was open but the engine wasn't ran for a long time then water can form in the cylinder. The new addives in gasoline also cause water to build up in the tank. Pump my have picked it up and it was pushed though that cylinders objector.