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2001 Ford Excursion

Question: knocking

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nickster, 5.4L V8, Upper Marlboro, MD, April 11, 2009, 14:12

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what causes the engine to knock or slightly ping when accelerated over 50mph?

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• Answer #1

  fernando April 11, 2009, 21:13
  

   Master

  There're interesting articles in the Auto Repair Encyclopedia about these;
  http://repairpal.com/what-is-engine-knocking
  and
  http://repairpal.com/what-is-engine-pinging
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• Answer #2

  Ron718 July 15, 2009, 08:36
  

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  Its usually the grade of fuel you are using. Buy some additive to put in the fuel to boost the octane.
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