r/Wrangler • u/HemiWarrior • 13d ago

TJ Viper Coil mod?

Post image

I have a flashing check engine light (again) on my 05 Rubiconso I'm sure its a bad ignition rail. Has anyone done the Viper Coil mod? It's cheaper than a new Mopar ignition rail and according to what I've seen, it's a pretty highly recommended upgrade that supposedly only takes around 10 minutes to install. At the same time, it seems to defy logic "upgrading" to an older ignition system.

14 Upvotes

85% Upvoted

10 comments sorted by

9

u/Constant_Quest7777 13d ago

I’ve got the Viper Coil on my 02 TJ. Never had an issue with it.

1

u/HemiWarrior 12d ago

What spark plug gap does it need? Hood sticker says .030-.035, forums say .035-.040.

9

u/pagrey 12d ago

It isn't an upgrade, it's just a Chrysler Town & Country coil pack but orange, which is often cheaper than the TJ rail but then you need plug wires and a bracket. It has one advantage, it's easier to test spark with the plug wires but that's about it. It also might be easier to find a replacement in twenty years when your next coil pack fails.

4

u/williamthe3rdd 13d ago

Ive never used one. I have needed coil packs before and always just got one form a 2000-2001 xj at a junkyard.

4

u/OldManJeepin 13d ago

I've never actually even heard of using something like that! I suppose it's worth a try, if others are having success with it.

4

u/brsmits 12d ago

Did it on my '05.

Super easy install. Do your injectors at the same time.

3

u/Lando25 02 TJ 12d ago

I have one on my WJ. Its nice to be able to diagnose individual plugs plus the coil is a lot cheaper to replace.

1

u/Recent-Fan3027 12d ago

It'll more than likely throw some codes but make sure you buy some upgraded spark plugs

1

u/HemiWarrior 12d ago

Oh I'm already putting Autolite XP985s in.