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  1. M52 pinging / pinking

    General E46 Forum
    Hi Everyone, long time reader, first time poster. I have a 1999 328Ci with the M52 Engine.. I've recently noticed that the engine is pinging quite often under normal operating conditions. It usually happens when i'm driving at normal city speed, say 50km/h (30mph) and just ease on a bit of...
  2. What does detonation/pinging sound like in an M54?

    Forced Induction Forum
    On my naturally aspirated M54, I'm getting a consistent metallic 'rattling' sound between 5000-5500 rpm on full throttle. It disappears above that. I have an Innovate LC-1 and my lambda is 0.87-0.89 during the time the noise appears, and goes steadily down to 0.85 (12.5 AFR) on red line. I'm...