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Hi Eric, Picked a nice easy username for you 🙂 long time reader/watcher, all the way from summery New Zealand! The Fairmont is looking awesome – love the sound of the motor on the dyno! I’ve got an E60 BMW 550i with the 4.8 V8 that seems to be pinging. No codes, no CEL. Long term fuel trim is something like -4% on one bank and +1% on the other; short term fuel trim is similar. MAF reckons it’s getting just over 6g/s of air at idle. Brand new OEM coil packs and spark plugs (old plugs were a very light tan colour). Have run many bottles of fuel system and combustion chamber cleaner through with no improvement. When it’s cold it runs absolutely perfectly, only pings when it is completely warmed up. I run 98 RON in it, and when it pings it seems to be slightly down on power, and the auto trans doesn’t shift as smooth. Any ideas? Cheers!