Mike,
Your correct when you say the R16 resistor, but this was tapping not pinging. I had my share of cars that pinged . This was definitely a TAP TAP TAP. And if this was pinging? Mercedes pinging sounds awhole hell of alot different than American and Import pinging. Anyways, this is the second day so far and all sounds good. I'm still going to give it a few more days. Idle is still smooth also.

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Richie
1986 300E