This is a COP (Coil On Plug) arrangement...... you'll notice the ignition
coils situated along the top edge of each valve cover, right beside the fuel
injectors. This job is fraught with "gotchas" if you are unwary. Start with
a cool motor and blow any dust/debris from around the COP area on both sides
of the motor. Each coil has a two wire connector and a 7mm socket is
required to remove the screws.... some of these are a tad difficult to
reach. Once the coils are out, the plug wells will need to be cleaned...
shop air is *usually* enough but water, coolant or other debris can make
it's way into the wells. There have been occasions where the plug boots ahve
become married to the walls of the plug wells.... usually #3 and #4 and
usually in response to coolant escaping the heater connections. I use
liberal amounts of WD40 and work the plug boot around in the well to break
it free. It is quite easy to rip the plug boot off in the well - this will
NOT make you happy. Additionally, we have come across the very odd plug with
enough crap around it to prevent engaging the hex of the socket. One of our
techs fashioned something akin to a hole saw for cleaning these out.
Installation torque is 13 ft/lb. You may want to take a hard stare at this
project before taking it on. When they go easy, they go easy but the task
can take some nasty turns.
I have one of those old Rainbow vacuum cleaners (the kind with a water
reservoir instead of a bag) and for my 4.6 I have rigged a foot long
piece of clear plastic hose slightly smaller than the plug wells with
little notches cut in the bottom end to the vacuum hose. I had a
paranoia about crap falling through the spark plug hole. :)
Once I remove the boots, I pour a little hot soapy water in the well and
let it soak for a few minutes then suck it out.
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