Changing #4 spark plug on a 1998 Navigator without removing engine

SOURCE: where are the plugs on lincoln navigator 1998

They are under the coil packs. You will need an 8mm socket to remove the bolt on each coil pack then remove them to access spark plugs.

SOURCE: Changing spark plugs on 2007 Hyundai Sonata 4 cylinder

You are correct. The plugs are accessed below these coils. Disconnect the coil connectors and remove the 4 10mm bolts which hold the coils in place -- then you'll have access to the plugs. Here's a pic

By the way, how many miles on this 2007 Sonata? You know the powertrain is under warranty (1st owner 100,000 miles). If you're having problems, have Hyundai dealership diagnose it and fix it under warranty.

SOURCE: changing spark plugs on lincoln town car

Remove the spark plug wires, remove the spark plugs,replace them. Do this one cylinder at a time if you never did it. On that year you may need to remove the upper intake to access the plugs on one side. In that case go to a shop. This would not be a novice job.

SOURCE: Changing spark plugs on 2001 SL1 Saturn V-4

Remove the plugs, make sure the new plugs are gapped to .040, put anti-seize on the threads of the new plugs, then install them and tighten accordingly.

PAUL MC G

• 1280 Answers
• Posted on Oct 25, 2009

SOURCE: Locating and changing spark plugs on 2007 Hyundai Sonata 4 cylinder

They are directly below the coil packs (10mm bolts).