V8 Level II
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Joined: Tue Dec 5th, 2017
Posts: 118
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This is a known problem on the 4.0 OHV engines. A very small leak can develop in the intake gasket which allows a tiny amount of coolant to be drawn into the intake runner. This is just enough to cause a misfire but not enough to show up as a noticeable coolant loss from the reservoir. An indicator is a very different plug reading on the affected cylinder, most commonly seen on cylinder #4. Could also be cracked head as noted above but this is worth checking too. Last edited on Tue Apr 10th, 2018 04:34 pm by V8 Level II
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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)
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