# Coil Pack

**URL:** <https://community.cartalk.com/t/coil-pack/55952>\
**Category:** Maintenance/Repairs\
**Tags:** wrangler, jeep\
**Created:** [October 4, 2010, 8:06pm UTC](https://community.cartalk.com/t/coil-pack/55952 "2010-10-04T20:06:48Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![tnglm003](https://avatars.discourse-cdn.com/v4/letter/t/c0e974/32.png) [@tnglm003](https://community.cartalk.com/u/tnglm003)\
**Post date:** [October 4, 2010, 8:06pm UTC](https://community.cartalk.com/t/coil-pack/55952/1 "2010-10-04T20:06:48Z")

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I have a 2004 Jeep Wrangler. This will be my third time to replace my coil pack since June/2010. What can be the root of the problem, causing these coil packs to go bad?

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**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\
**Post date:** [October 4, 2010, 9:22pm UTC](https://community.cartalk.com/t/coil-pack/55952/2 "2010-10-04T21:22:59Z")

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Is it really a coil pack (two or three coils and has spark plug wires going to four or six plugs), or is it a COP (Coil On Plug, one coil going directly to one plug).

If it’s a COP, then it’s either the spark plug or that oil or water is accumulating in the plug well.

If it’s really a coil pack, then you can add the spark plug wires as suspects too.

Anytime you change coil(s) the associated spark plugs should be changed too, every time.

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [October 4, 2010, 9:25pm UTC](https://community.cartalk.com/t/coil-pack/55952/3 "2010-10-04T21:25:30Z")

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Make sure the correct plugs and wires are installed and check the wires for any signs of leakage (arcing). Make sure the power to the coil is ok also.

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**Author:** ![tnglm003](https://avatars.discourse-cdn.com/v4/letter/t/c0e974/32.png) [@tnglm003](https://community.cartalk.com/u/tnglm003)\
**Post date:** [October 4, 2010, 11:41pm UTC](https://community.cartalk.com/t/coil-pack/55952/4 "2010-10-04T23:41:03Z")

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It’s a true coil pack. Thank you for your replies.

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**Author:** ![orangevega](https://avatars.discourse-cdn.com/v4/letter/o/9fc29f/32.png) [@orangevega](https://community.cartalk.com/u/orangevega)\
**Post date:** [October 5, 2010, 4:51am UTC](https://community.cartalk.com/t/coil-pack/55952/5 "2010-10-05T04:51:57Z")

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What engine do you have?

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**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\
**Post date:** [October 5, 2010, 11:32pm UTC](https://community.cartalk.com/t/coil-pack/55952/6 "2010-10-05T23:32:45Z")

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Is the coil pack located in a spot where it might be subjected to excessive heat if there were a heat shield missing, or perhaps an exhaust manifold leak?