One problem related to engine knocking noise has been reported for the 2008 Honda Civic. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Honda Civic based on all problems reported for the 2008 Civic.
Shortly after receiving a voluntary warranty extension/ recall my wife's 2008 Honda Civic lx 4 dr. Experience an engine block crack after driving on the freeway. I drove it to the dealer in waukesha, WI where is was confirmed as a crack. Since the replacement I have experienced issued with the new block including a knocking sound in the engine at low rpm's I was advised by Honda in CA that the block is new however the older internal engine block parts were being reused to include the crank, pistons, etc. Which is causing the new engine to fail also.