Spark plugs location/replacement

1999 LINCOLN NAVIGATOR
150,000 MILES • 5.4L • V8 • 4WD • AUTOMATIC
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C0BY
  • MEMBER
  • 1 POST
How do I change the spark plugs? I'm having trouble even locating where they are.
Sep 10, 2019 at 4:11 PM
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KASEKENNY
  • ✓ASE Certified Mechanic
  • 18,907 POSTS
  • ASE Certified Mechanic
Hi,

Here is the procedure for removing them. The first 4 screen shots show for the dual overhead cam engine (DOHC) and the next 3 are for the single overhead cam (SOHC) engine.

In both cases, you need to remove the coil on plug in order to access the plugs. I suspect you have the DOHC engine because it has a coil cover that you need to remove in order to gain access.

Let me know if you have questions and we can go from there. Thanks
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Sep 10, 2019 at 4:39 PM
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