Question about 2004 Ford Explorer

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Hi i have a Ford Explorer 2003 v8 4.6 L.

Have a mechanical knock in cylinder head area. Had cylinder heads reconditioned. Knock still there. Replaced cylinder heads with 5000klm
old heads & knock still there. Any ideas?
Thanks
Evan

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Hi and welcome to FixYa,

A few exploratory queries:

  • have you tried changing fuel to a higher octane?
  • is the "knock" consistent or intermittent?
  • when the head(s) were reconditioned/replaced, were the pistons checked?
  • was a compression test done before and after? If yes what was the reading pls?
  • have you tried switching/swapping sparkplug wires?
  • any other symptoms, indicators, such as higher than normal operating temperature, poor idling when cold?
Pls post back. Good luck and thank you for using FixYa.

Posted on Feb 09, 2009

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Posted on Jan 02, 2017

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