[Fireplug]

J-Ri
You are wrong , pulling a plug wire will kill that cylinder and if that rod is bad the noise WILL change because now it has no load on it. This is a very old trick to use and if done correct it will work or at least give you a good idea as where to look for the noise. This is not to find main bearing problems but for rod/ piston problems.
This was showen to me 20 years ago by a MASTER Auto Tech and when I was MASTER I mean this guy new his stuff. He could tell you what was bad with your car by just walking up to it. Now I know the cars have changed a lot over the years BUT the 4 cycles and how they work have stayed the same