My r33 started pinging badly when i started it this morning. I haven't driven it today, just in case. I'm wondering what could be the cause? I've always filled up the car with optimax or synergy 8000. Will a simple ECU reset solve this problem? Or do i have any other problems? The only engine modification i have is a panel filter, and a bleed valve (set to 7psi). Any thoughts/ideas would be appreciated.