Engine Mechanical problem
2004 Mercury Marquis Automatic 48,000 miles
My engine knocks even though I have had 2 fillups with 93 octane gas and added ,Marvel, a gasoline addive. I still have the engine knock. Could it be a valve problem?
2004 Mercury Marquis Automatic 48,000 miles
My engine knocks even though I have had 2 fillups with 93 octane gas and added ,Marvel, a gasoline addive. I still have the engine knock. Could it be a valve problem?
Apr 10, 2010 at 5:41 AM
