Update: 2001 Honda Passport Pinging Issue

A previous post My Honda Passport is pinging... describes a well known problem in the car my wife drives normally. At certain engine speeds there is a pinging (stands for pre-ignition) noise, which is bad because it means that the fuel mixture is getting ignited and burning prematurely.

I followed all the steps from the information that I could find and still no luck. 

1. I put new spark plugs in
2. I ran through some fuel treatment
3. I replaced the air filter
4. I changed the oil

I can say that the spark plugs need to be changed; I think they were the original plugs from 2001, after almost 70 thousand miles.

Alas, still pinging.