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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Other parts for Jeep Wrangler
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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