Carbon Knock 1997 Suburban

[MN_DIY_Garage]

I am experiencing some carbon knock under acceleration and was wondering if anyone has tried the various liquid combustion chamber de-carbonizers with any success. I don't know if GM sells such a product, but I know Ford does, and I'm sure there are many aftermarket products. Any opinions on the most effective products would be helpful.

[V-8Fan]

Not trying to be a smartass or anything, but I'd like to be know how various causes of "knock" or pinging can be classified and how to tell them apart. (In fact, I am puzzling over my '95 Grand Marquis which pings under acceleration over 70 mph using 89 octane fuel. It pings worse using 87 octane, naturally, but I think it's supposed to run on 87.)

[STUBBORNM]

The Gm Dealer Sells This Its Called Over The Head Engine Cleaner. It Comes In A Spray To Spry In Your Intake And Another That Pours In The Tank. This Stuff Is Awsome. So Awsome That Its Banned For Sale In California! These Vortecs Are Famous For Carbon Build Up!!!!!

[010175]

Is the name " over the head cleaner"? Would a dealer know what to sell me if I use "over the head cleaner"? Thanks Dave