Village Idiot
Well-Known Member
- First Name
- Matthew
- Joined
- Dec 22, 2019
- Threads
- 6
- Messages
- 62
- Reaction score
- 39
- Location
- Southern Utah
- Vehicle(s)
- 2019 JLUR
I have a 19 jl that occasionally has mild knock at low rpms under moderate load as well. My brother has a 19 grand Cherokee with same pentestar engine. He also has the knock at low rpms. I don't believe this is dangerous for the engine and very common. I tried running premium fuel and 89 octane as well. I did not hear knock while using premium, still heard it at 89. Other than that, no performance or mpg differences, though I was hardly scientific. For what it is worth even with 87 octane and 35s loaded with 4 people, this engine impresses me. Under wide open throttle it pulls very hard and no knock in that situation ever. Passing other vehicles is not difficult.
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