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Ronmaf Ronmaf is offline
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Posts: 6
Join Date: Jul 2020
Car: 2018 Wrangler JLU
Default JB4 2018 Wrangler JB4 - 07-05-2020, 03:14 PM

Hi, I purchased the JB4 tuner and have noticed a sharp decrease in fuel economy. I am not dogging the engine at all I am driving normally as I was before I installed the JB4.
I am running it on the default stock settings that came with the unit. I donít have any of the cables are Bluetooth connectivity to look at it in anyway. My question is are these results normal? Do I have to buy more accessories to troubleshoot a product that should work out of the box, or is this supposed to be customized from the start For my specific Jeep.
Other symptoms are that on rural highways the jeep doesnít want to shift into 8th gear. This only happens at around 50 to 60 mph. Over that speed it ****s to eight deer and cruisesfine.
Any help would be greatly appreciated, thank you.
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