Never looked under a hood of a fourth Gen Sir, but yes it isn,t a pretty job. I always seem to change mine during cam swaps as i stand up infront of the motor under the hood, however the best way to get at that is to lay down a piece of foam over a moving blanket and lay across the motor as you need to get your face in there, either come in from the front or over the approprite fender. I use a 4" extension back there. If it won,t go in with the socket on then place socket in hole followed by the extension then by the ratchet (a good one with quick release button). I have a craftsman ratchet i use that is slightly longer than a stubby. I would suggest tackling those difficult ones first then your home free.........Remove the 4 coils on each side outta the way in a oner will make it easier. As far as plugs ruining the coils I would have to say based on my experience on the older models with plug wires.........********......Coppers are all that is needed an 30k miles is alot of driving so you have to pay the fiddler........unlike other vehicles factory equipped with platnums and 60 k intervals. Long post, Sorry but with patience and a good attack the job can be done easier everytime. Worst case pay the Man to do it. Danny P.S. Small brush of antisieze across the threads of new plugs on install will allow easy removal in future.
