pinging - detonation ?
I need to get rid of this embarrasing "pinging" or "spark detonation" or what ever it is, only happens at higher rpms, WOT. Not only sounds terrible, but am sure it is no good for the engine. What are the steps to rid pinging? I tanked up on some hi-test, and added a bottle of chevron cleaner, still there. I have not had this since Oct (when adv. timing)last year, but it is back. 95 GT, 10* timing. Any ideas?
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