They are not visible . They are covered by an inspection plate that is held on by two bolts . Remove the inspection plates thus revealing the coil packs . Pop coil pack(s) out carefully, avoiding damage to coil. Once removing coil you should be able to see or get to spark plug. This is not an easy task and would recommend a professional. Good luck!
tell me how to replace a starter in a Lincoln navigator"?
According to the 1999 Lincoln Navigator Owner Guide ( 5W-30 )
According to the 1999 Lincoln Navigator Owner Guide : ( 113.6 liters / 30.0 U.S. gallons )
On a 1999 Lincoln Navigator : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
On a 1999 Lincoln Navigator : The ELECTRIC fuel pump is INSIDE the fuel tank ( the fuel pump is " suspended " in the tank from the top of the tank )
On a 1999 Lincoln Navigator : If it is equipped with the six disc C/D changer , it is in the center console
On a 1999 Lincoln Navigator : Open the drivers door and on the latch pillar you will see an information sticker that shows the original tire size on the vehicle from the factory
the replacement is an 8" subwoofer
For a 1999 Lincoln Navigator : Miles per U.S. gallon : ( 11 to 12 in the city / 15 to 16 on the highway ) according to a website I was looking at )
spark location on a 1999 Lincoln continental
The spark plugs are underneath the ( 8 ) individual coils on the Coil On Plug ( C.O.P. ) ignition system firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Lincoln Navigator