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Discussion Starter · #1 ·
After checking out prices for new jeeps, I’ve decided to keep my TJ with 90k miles on it for another 10 or so more years. I spend a lot of time in the back country of Utah, so long-term reliability is critical. For my 90k service, I am not only changing the coolant but also the water pump, thermostat, hoses, etc. Normally I would change out plugs, spark-plug wires, distributor, pcv etc as well, but I have the ignition coil rail. I’m changing the plugs and wonder whether I should change the coil too. How prone to degradation and failure is the coil and is it likely to fail by 120k total miles? Opinions on whether I should replace it as part of a major overall renovation or let it go if and until it fails? Also, I am planning to use OEM MOPAR parts rather than other manufacturers. I know MOPAR costs a lot more, but I am betting that they are more reliable. Again, what advice do you have? Thanks in advance!
 

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For critical parts like that, I have learned to stick with Mopar. In 21 years of TJ ownership and over 50 years of car ownership, the only time I have had a failed coil was with an aftermarket ignition coil.

The last time I had an ignition coil failure it was the aftermarket Screaming Demon ignition coil sold by Quadratec. It was no more than a year old too. That was offroad and 50 miles from nowhere. It was fortunate someone in my wheeling group had a spare OE Mopar ignition coil with them.
 

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Coil rails are pretty reliable but easy to pick up a spare at you pull it but beware the 1999 4.0 WJ connector is wired in a different order then all the rest

200-2001XJ and 2000-2006 TJ
And 2000-2004 WJ all interchange plug and play

It is also easy to swap to a V6 minivan coil plug and wires if you are so inclined

Even the viper V10 coil pack works as it has 2 coil packs one three pairs for six cylinders and one 2 pairs for the other 4 cylinders

If swapping to coil pack stick with Chrysler products as others can damage the coil drivers in the pcm by flowing too much current


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I'm at 165K on the original coil rail.

However, if you're going to the middle of nowhere, I'd carry a spare.
 

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Even if you don't need it, you may be the Shining Knight that has a spare for some one else.
 
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Discussion Starter · #6 ·
Thanks for the advice

Thanks for the advice! My take-aways are:
1) The original coil rail is very reliable and does not need regular replacement
2) Stay with MOPAR parts.

Rees
 
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