Hi All,
My Mazda Protege5 is my commuter car, and is a stock, high-mileaged and well serviced car. It's got 148,000 miles on it, has seen regular oil changes at 3000 miles and plugs at every 30k.
I've noticed intermittent pinging at low RPMs, especially at the 1-2 shift around 20 mph. I'm...