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potholes noise pinging

  1. 4.5 Generation Altima (2010-2012)
    This has started recently after 7 months, when i go over bumps there is no noise. But when i hit potholes or uneven road(when theres a lot of shaking) i get this engine pinging noise for a second pinging noise similar to when u put in low octane gas but it is very brief. Yes i use low octane...