• Tiny
  • landonskinner
  • 2006 Mercury Mountaineer
  • V8
  • AWD
  • automatic
  • 60,000 miles

I have a 2006 Mercury Mountaineer AWD with the 4.6. At start-up, when the engine is cold, there is a loud and very noticeable knocking sound coming from the passenger side of the engine. I have ruled out the ever noisy injectors. After about 30 seconds, the noise reduces to an acceptable level. Lately, it is getting worse. I have chased the noise down to the front of the passenger side valve cover/exhaust manifold area. As I said, the noise gets better when the engine warms up. I am using the 5W20 oil recommended and change the oil before the computer tells me to. Any ideas as to what this could be?

Saturday, June 25th, 2011 AT 10:36 PM

1 Answer

  • Tiny
  • rasmataz
  • Member

Could be a valve lifter leakdown problem diminishes when engine gets to operating temperature-

Was this
Saturday, June 25th, 2011 AT 10:44 PM

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