[Capecod 02/4S]

I'm about to replace the IMS with an LN unit in my 02 C4S. Bought LN tools. Read lots of literature from different sources but I am confused, Do I really need to pull all 4 cam plugs if I am using the LN tool? Which chain tensioners do I need to loosen. Seems to me I need to only remove the plugs from the driver side rear end (closest to rear bumper) of cyls 1-3 and install the tool designed for 3 chain engines while locked in at TDC and loosen the one tensioner, Is this correct?

Which tool is considered the LN easy out? Nothing looks like any easyout I have ever use.

What is the little threaded nut like thing with the wire attached to used for?