I have, both ends, multiple times. That was what I first thought of. Neither one is hitting the exhaust or anything hot, both are routed the factory way, no corrosion on the ends..
I noticed that several readings on the gauge display of the PLC do NOT go to zero when the battery drops out..is there a clue there, or is that nothing? Should I add some higher octane fuel and see if the knock goes away at least? Maybe multiple problems?