Had a Boxster come through that was throwing some engine codes and running rough. Read down the codes and had a couple of possibilities for causes, so we started looking around. Fueling issue was the first thing to check, so I got the stethoscope out and listened to each injector. 5 had a distinct fast “tick tick tick” sound like normal, but the #3 cylinder had a “thunk….thunk……thunk” sound to it, which told me we probably have an over fueling …

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