# Antifreeze leak leading to coil misfire **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** ford, expedition\ **Created:** [May 27, 2010, 3:41pm UTC](https://community.cartalk.com/t/antifreeze-leak-leading-to-coil-misfire/49452 "2010-05-27T15:41:56Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![JStephens](https://avatars.discourse-cdn.com/v4/letter/j/f05b48/32.png) [@JStephens](https://community.cartalk.com/u/JStephens)\ **Post date:** [May 27, 2010, 3:41pm UTC](https://community.cartalk.com/t/antifreeze-leak-leading-to-coil-misfire/49452/1 "2010-05-27T15:41:56Z")
I have an 03 Expedition. In Jan I had coil #8 replaced. A week later #7 had water in it, but was salvagable. Monday (5/24) #6 was replaced and had antifreeze in it. Apparently there is a leak, but could not be detected from the leak tracer the mechanic used. The next day it started missing while at a red light, and again when accelerating passed 50 mph. I assume it’s another injection coil, but I don’t want to replace anymore until we figure out where the anitfreeze is leaking from. There is nothing on the ground to show a leak and I do not have any white smoke coming from the exhaust. Any ideas where the leak might be? ---
**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\ **Post date:** [May 27, 2010, 4:01pm UTC](https://community.cartalk.com/t/antifreeze-leak-leading-to-coil-misfire/49452/2 "2010-05-27T16:01:09Z")
Which engine do you have? ---
**Author:** ![JStephens](https://avatars.discourse-cdn.com/v4/letter/j/f05b48/32.png) [@JStephens](https://community.cartalk.com/u/JStephens)\ **Post date:** [May 27, 2010, 5:20pm UTC](https://community.cartalk.com/t/antifreeze-leak-leading-to-coil-misfire/49452/3 "2010-05-27T17:20:34Z")
5.4 Liter, V8 Triton. I also checked the oil, no signs of the antifreeze getting in there. ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [May 27, 2010, 7:24pm UTC](https://community.cartalk.com/t/antifreeze-leak-leading-to-coil-misfire/49452/4 "2010-05-27T19:24:12Z")
On the 4.6L version of this engine, one of the heater hoses runs UNDER the intake manifold… A well equipped shop can pressure-test the cooling system and find the leak… You are correct in that these coil-packs (COPS) have ZERO tolerance for getting wet…And you might as well changed the dead spark plug too… ---
**Author:** ![JStephens](https://avatars.discourse-cdn.com/v4/letter/j/f05b48/32.png) [@JStephens](https://community.cartalk.com/u/JStephens)\ **Post date:** [May 27, 2010, 7:30pm UTC](https://community.cartalk.com/t/antifreeze-leak-leading-to-coil-misfire/49452/5 "2010-05-27T19:30:55Z")
Thanks for the info. I’ll pass it on to my mechanic.