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