Hey Guys,
Just wanted to ask about spark knock, I have a 1997 Chev. Z71 with a 5.7 liter. It spark knocks no matter what grade or brand of fuel i use, I have put cleaners in it and even taken to the dealer just to pay them $80 and all they could tell me is that it was carbon buildup on in the engine and suggested something they call a motor vac. (what ever that is) for $180. I guess what i am trying to ask is there anything i can do or check to solve this problem. Any help or suggestions would be very appreciated. And by the way it has 124,000 miles on it and runs fine otherwise.
Thanks in advance
gardnerk20