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2004 Mercury Marquis engine knock

2004 MERCURY MARQUIS
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TAPMAR
  • MEMBER
  • 1 POST
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?
Apr 9, 2010 at 10:41 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Is it a knock, tick, or a pinging under accelleration or when the engine is under a load?
Jun 10, 2010 at 12:36 AM
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