Hi everyone, 2002 1st gen prius. When I am starting uphill at a standstill, under light load (lowish rpms, probably around 2000-3000 rpm), I started hearing a ticking/pinging sound this morning. When I press the accelerator so the rpms go up, it went away. It's ways always at around 10-20mph, under moderate load, only when going uphill. Any ideas? I just filled up this morning -- perhaps it was bad gas?
