Why does my Coil Pack crack between the # 2 and 5 cyclinders?

Tiny
GOLIATHS_WHITE_WOLF
  • MEMBER
  • 2002 DODGE CARAVAN
  • 125,000 MILES
I have a 2002 Grand Caravan with a 3.3l v6.I keep cracking the coil pack between the # 2 and 5 cyclinders. The van will act fine for months and then without notice the coil will crack. I was told to replace the plugs and wires due to a possible grounding problem. This did not correct the problem. I have noticed that the problem came about shortly after breaking a serp belt. Also the van will starting to misfire if its put under a severe load and if pushed too hard the coil cracks. My buddy is a Master Tech at a Dodge dealership and he said to replace the ECM. I would like to avoid the cost if a simpler solution could correct the problem. The van is also throwing a code for oxygen sensor heater since this problem arose. Thank you.
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Wednesday, October 12th, 2011 AT 1:51 PM

8 Replies

Tiny
ASEMASTER6371
  • EXPERT
First of all, I would look at the mounting bolts for the coil and make sure they are torqued properly. If it is ok, then I would be looking at wires replace the plugs along with them. Cracking is unusual but it sounds like you have done the basics. I would not be so quick to replace the pcm.

The o2 sensor has nothing to do with it. It may be a failed heater internally that requires replacement

Roy
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Wednesday, October 12th, 2011 AT 2:21 PM
Tiny
GOLIATHS_WHITE_WOLF
  • MEMBER
The plugs and wires were replaced with the second coil.I dont know if I torqued down the coil properly. I was afraid of overtightening the coil. I did not want to crack them. They are def not over tightened.I just dont understand how this thing can be fine for a month and then just pop.
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Wednesday, October 12th, 2011 AT 2:43 PM
Tiny
ASEMASTER6371
  • EXPERT
That is real to say from here because I cannot see it or touch it. I agree that it does not make sense but I always start with the basics. Check the mounting bracket for the coil as well. Is the crack a stress crack? How big is it? Where is the crack?

Roy
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Wednesday, October 12th, 2011 AT 3:13 PM
Tiny
GOLIATHS_WHITE_WOLF
  • MEMBER
The first coil had a hairline crack between 2 and 5 post. The second coil completely cracked open and ruptured in same area. Third coil hairlined the same as first. The mounting bolt for coil to bracket to manifold is next to #2 cylinder. Mounting bolt through coil to bracket is next to #1 and 3 cylinders.
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Wednesday, October 12th, 2011 AT 3:35 PM
Tiny
ASEMASTER6371
  • EXPERT
I still think it is a mounting issue that is stressing the coil. I will put it out to some other guys to see if they have seen this issue with a resolution.

Roy
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Wednesday, October 12th, 2011 AT 4:09 PM
Tiny
BODYSHOPBOB
  • MEMBER
My 2006 grand caravan coil pack cracks on the bottom. Does any one know why
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Tuesday, January 23rd, 2018 AT 6:29 AM
Tiny
KEN
  • ADMIN
It sounds like they got overheated can you shoot a quick picture with you phone and upload it here so I can tell for sure?
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Thursday, January 25th, 2018 AT 10:23 AM
Tiny
BODYSHOPBOB
  • MEMBER
Thank you for your reply, but after the seaond one I replaced I used urathane on the bottom to seal it I thought? I have put a oem in it yesturday, and It looked so different than the after market.
Thank you for your responce
Bob
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Friday, January 26th, 2018 AT 12:51 PM

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