Engine knock sound on 2008 Buick Lucerne

My engine tends to "tick" or knock when I step on the gas. It does not do it when idling only on accelerating.

by in Merrillan, WI on November 24, 2010
2 answers
ANSWER by on November 24, 2010
sound like spark knock need run 93 oct gas
ANSWER by on November 22, 2015
Definitely run high octane fuel in this car or you could run into very costly engine repairs.
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