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Old 06-15-2017, 03:50 PM   #1
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Join Date: Feb 2005
Location: Fall Creek, Wisconsin
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2004 Expedition 5.4 #4 & #8 misfire after new plugs/boots

I'm working on a 2004 Ford Expedition E/B 4x4 5.4L

We recently did a body-off engine swap. New engine fired up run excellent but had an intermittent miss. We discovered water in the back two plug holes (from being pressure washed by the auto recycler).

I decided to do new autolite platinum plugs and new coil boots & conductor springs. I cleaned each coil spade and dabbed with a q-tip of di-electric grease on each end of the conductors.

Installed all 8 coil boot & plugs and dead cylinder misfire on #4 and #8 cylinders (the furthest back & toughest to get to).

I swapped coils & boots from different locations and problem still stayed on #4 & #8.

back cylinders have about 190 lbs compression.

plugs pull out and smell of gas.

coil boots & spark plugs fire out of the engine.

PLEASE HELP!! I'm at my whit's end!

Also: idling 5 minutes will not set any codes.
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