This thread makes me wonder if this is the problem I'm having. I've assumed it's engine pinging, preignition, etc. I have a 2013 JK 2Dr Sport, Auto transmission.
My issues sounds more like rattling a chain under accelerating conditions. It happens more under a heavy acceleration (as in merging into traffic) but also have heard it under minor acceleration. The problem seems to occur in hot weather and when the engine is warmed up. I think it improves with 89 octane but does not eliminate it. I cannot make it occur on demand and the dealer cannot duplicate it to try and fix it.
I have tried Techron a few times, no difference.
If it is possible that a cross member is having some interference, is this something I can see and feel if I get under and move things or is the issue a very minor torque on a clamp, etc?