Spark knock

[marky38]

Anybody else get spark knock?..It's not that bad but annoying...It does it with or without the AC on..I might try 89 octane to see if it goes away.....2007..190k miles...thanks

 

[tommudd]

computer controls all of that, may have another issue

 

[LibertyTC]

Start with the spark plugs, use NGK ZFR6F-11G and set gap at .040 inch. Get new plugs installed every 35k miles, if you have not done them already.
Consider all new Mopar coil packs as a tune up item at 190k miles, if they have not been replaced.
Spark knock can also be related to bad gas, low octane & carbon build ups, dirty injectors.
I'd try to go to wallmart get 2 bottles of Chevron Techron concentrate add that to the highest ocatane you can find.

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Then take the jeep for a good long hwy rip, to the rev limiters a few times up steep hills, and see how the jeep runs then.