Ignition Coils - Replace or Not. - JeepForum.com
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post #1 of 6 Old 09-17-2019, 02:54 PM Thread Starter
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2001 WJ 
Join Date: Jul 2012
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Ignition Coils - Replace or Not.

Iím having new valve cover gaskets installed tomorrow and I was thinking that this might be a good time to replace the ignition coils as well. (My WJ is a 2001 model with the 4.7 and 139K miles.) I ordered a set of coils on Amazon and they arrived yesterday. But now I wonder, the truck is running fine and my only reason for replacing the coils is PM. Just wondering what you guys think, is this a waste of money?

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post #2 of 6 Old 09-17-2019, 03:16 PM
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2001 WJ 
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Probably not necessary. I've got over 400,000 miles between 2 WJs and I've never had one fail. If you want to do some good PM in that area you might consider injectors though I haven't had one of those fail either.

1999 WJ Limited 4.7/NV247
2001 WJ Laredo 4.7/NP242
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post #3 of 6 Old 09-17-2019, 03:49 PM
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Mine has 220K and I have replaced 4 so far, 2 when I initially purchased it (misfire was the reason it was sold) and I had one go shortly after I did the 2 new ones and plugs and one recently (2 year span between) for me, its worth replacing all while you are there with that mileage. I can say on the 2 latter failures I did get interference in the radio (popping in time with ignition) before the failure, and no popping after the replacement. I will caution you on the Amazon coils, depending on what set you buy, I put some in my CTS and although the car ran fine, the coils set 6 misfire codes (p0301 through p0306 and p0300) I sent them back and used BWD coils and all was fine. I also used BWD coils in the jeep with no issues. May want to consider plugs at that mileage also
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post #4 of 6 Old 09-17-2019, 05:16 PM Thread Starter
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Thanks for your thoughts. (Plugs were replaced this winter.)
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post #5 of 6 Old 09-17-2019, 09:26 PM
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2001 WJ 
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I wouldn't worry about it, unless you are throwing codes due to bad coils. I have 200k+ on my 4.7 and just now replaced two of the eight coils, but I had codes for them.

2001 WJ Limited w/ QuadraDrive
Bilstein 5125's
jgcparts 2.5"/2" BB
JK take offs & 265/75R17's
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post #6 of 6 Old 09-18-2019, 05:48 AM
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I practice The saying - "If it ain't broke..."

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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