Oil Change Causes Fowled Plud/Blown Coil Pack/Burnt Plug Wir

blue_kjR417 · **Posted:** Wed Dec 31, 2008 11:13 pm

Today I changed my oil from Valvoline Max Life High Mileage with a Fram High Mileage Filter to Mobile 1 Full Synthetic High Mileage with a Mobile 1 Extended Performance Filter. After I got finished I backed the Jeep off the ramps and left it running, as I pulled the ramps away I noticed the jeep was shaking terribly! So I jumped in the drivers seat and did a quick sweep at all the gauges which did me no good when I remembered alls we have are Fuel and Temp! Which is stupid if I might say so myself! Then the Check Engine light started flashing and then after about the 4th flash it stayed on so I shut the engine off, and checked to make sure I got the drain plug back in good and didn't just pour all my new oil on the ground and it was in, so popped the hood and checked the fill cap it was on good thought it might throw a code if it wasn't tight enough. Then checked the filter to make sure it was on tight too, it was. So as me and my Dad started it back up to listen and see if the shaking was from lack of oil or something else, and we concluded that it was missing on atleast one cylinder. So he called our mechanic and he said it was probably a coincidence and while up the ramps one of the injectors could have leaked a little and when I started the engine it probably fouled a plug or burnt up a coil pack or there could possibly have a problem with a plug wire, anybody heard of this happening or have any other ideas of what it could have been?

tjkj2002 · **Posted:** Wed Dec 31, 2008 11:33 pm

No plugs wires to go bad on a 3.7 V-6 in the KJ,you'd have bigger issues if a a injector was leaking,plus most only leak externally. .Pure luck that a plug or coil went bad right at your oil change,a loose oil cap will not set a engine code,either will low oil pressure.

tommudd · **Posted:** Wed Dec 31, 2008 11:38 pm

so did you pull any codes off of it? If so what was it?

blue_kjR417 · **Posted:** Fri Jan 02, 2009 4:46 pm

I just went to Advance Auto Parts and had them pull the codes, there were 5.

1. Random/Multiple Misfire
2. Cylinder 6 Misfire
3. Random/Multiple Misfire
4. Cylinder 6 Misfire
5. Ignition Coil Failure

DryBones · **Posted:** Fri Jan 02, 2009 11:22 pm

sound like you need to replace the coil on 6. $22 and 5 minutes. At least a place to start.

blue_kjR417 · **Posted:** Sat Jan 03, 2009 1:43 am

DryBones wrote:

sound like you need to replace the coil on 6. $22 and 5 minutes. At least a place to start.

Yeah me and Dad are goin to pick one up at Napa tomorrow and swap it out
6 is the one on the drivers side closest to the firewall right?

tommudd · **Posted:** Sat Jan 03, 2009 2:21 am

nearest firewall yes but on right side ( passenger) :wink:

plus not sure how many miles you have on but its not good to replace one and not all. Replacing one which will be stronger firing than the rest can mess things up as well.

blue_kjR417 · **Posted:** Sat Jan 03, 2009 1:34 pm

tommudd wrote:

nearest firewall yes but on right side ( passenger) :wink:

plus not sure how many miles you have on but its not good to replace one and not all. Replacing one which will be stronger firing than the rest can mess things up as well.

I have 85k and these things are like 30 bucks i don't have 180 on hand...
should i go a head and replace plugs too?

DryBones · **Posted:** Sun Jan 04, 2009 1:00 am

I've replaced 1 while doing a plug change with no problems. You will need extensions and a swivel socket for that #6 plug. good luck!

blue_kjR417 · **Posted:** Sun Jan 04, 2009 11:58 am

We replaced coil #6 took it for a test drive it was fine unless you got about 2500rpms and then it would fall on its face so we swapped the plugs now its running fine

DryBones · **Posted:** Sun Jan 04, 2009 10:22 pm

WOOT! Sure is fun working on your own rig! WOOT!

Oil Change Causes Fowled Plud/Blown Coil Pack/Burnt Plug Wir

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