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Joined: Tue Dec 5th, 2017
Location: Michigan, USA
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I put the original coil pack back on the 3.0 so I could use the brand new 4.0 coil pack I had on the 3.0... on the 4.0. Then I replaced #4 spark plug wire and put a clean plug in there again.
Last ditch effort to disprove the fact that the head gasket is blown between #4 cylinder and one of the water jackets.
If it starts missing tomorrow on the way to work the nightmare starts.
Could be the head or head gasket. However, it might be something simpler. The gaskets between the heads and the lower intake are notorious leakers on the 4.0 OHV engines. This allows coolant to be sucked into the runner under manifold vacuum and this can cause misfire. Guess which cylinder is usually affected first .... #4.
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2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals, BW4406 manual T/C
Aussie Locker, Torsen L/S, 4.10's, Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, sway bar discos, Heated seats, Explorer EATC, Trip Computer and consoles
Other rides:
2016 C-MAX Energi (plug-in Hybrid)
2011 Taurus SEL (highway cruiser)
2003 Ranger 2.3L M5ODR1 Regular Cab (drudge)