engine knocking when i accelerate on 2006 Chevrolet Cobalt SS

as soon as i accelerate the engine starts knocking, doesn't happen when at park idling and i rev it. anything?

by in Camp Lejeune, NC on November 06, 2010
1 answer
ANSWER by , November 06, 2010
could be many things-start by checking the oil.could be a rod knock.