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Originally Posted by gmcjohn
i took my truck to dealer for a "pinging" soundand thy wanted to "de-carb" it for $118.00 . anyone know what this is and is it something a average guy can do?----by the way i have used only mobile gas in it since i purchased it in june of last year-i even went up a grade for two tank fulls -still does it
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Most likely they are doing a treatment similar to "seafoam". Do a search on this forum (or even a google search) to see more about it.
You do not mention what year but if you have 96-99 Vortec, then the cam retard should also be adjusted to the correct setting.
Seafoam basically cleans the carbon buildup inside the engine.
//2000CAYukon