Stick with Champion plugs in the 4.0L inline 6. Anything else will have you chasing a “stumbling” idle.
Pros: prevents stumbling idle
Vehicle:
Jeep Wrangler
Best Spark plug for Jeep Wrangler
I use champion on my 04. No issues. The more expensive ones that’s when the issues start
Pros: no issues
Vehicle:
Jeep Wrangler
I use Champion in my 02. Never had any issues.
Pros: never had issues
Vehicle:
Jeep Wrangler
On my old Jeep Wrangler, the only plugs that it ran well on were NGKs.
Pros: runs well
Vehicle:
Jeep Wrangler
If these are for a TJ (97-05) return them and get NTK (NGK). The 4.0 will not like anything else.
Cons: engine incompatibility
Vehicle:
Jeep Wrangler
I’d never put autolites in a Jeep, send em back and get champions or NGK depending on year and model.
Vehicle:
Jeep Wrangler
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Top manufacturers of spark plug for Jeep Wrangler
This part for Jeep Wrangler is made around the world. We have reviews for spark plug manufacturers from countries such as: USA, Japan .
In March 2026, the ranking of spark plug for Jeep Wrangler on PartReview included 3 manufacturers. It is based on 6 reviews and 18 votes.
Which spark plug to choose for Jeep Wrangler?
Last month, PartReview users preferred Champion. 50% of positive votes went to this manufacturer.
In second place: spark plug NGK — 0%.
Third place: Autolite with 0% of the votes.
In the overall ranking of spark plug, which aggregates opinions of owners of different car makes and models, these brands hold the following positions:
- Champion ranked 16, PR Score — 53. Based on 60 reviews and 186 votes.
- NGK ranked 1, PR Score — 81. Based on 763 reviews and 2360 votes.
- Autolite — rank 17, PR Score — 41. Based on 140 reviews and 434 votes.
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