Quote:
Originally Posted by Merc Cruzer
Single grommet, 2 brackets
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They no longer recommend running plug wires up against each other because the magnetic field from one plug wire can actually create spark in the wire running along side of it. You can take a plug wire that is not connected at either end and lay it along side a firing plug wire and it will create a spark in the plug wire that's just laying there. It would only be a problem if the parallel wire is next in the firing order. Like a Ford FE big block. The last two cylinders in the firing order were 7 and 8. So, when 7 is firing 8 has just filled the cylinder with fresh fuel/air because it's at the bottom of the intake stroke. This could cause engine knock if 7 induced current into the number 8 wire and ignited the air/fuel mixture early. It was easy to have this happen too because cylinders 7 and 8 are right next to each other. The fix is to keep them as far apart as possible, or cross them at 90 degrees.
Its really important on the wiring on the newer computer controlled cars to keep plug wires away fron the compuer controlled wiring. They had a problem with the Presidential limousine. When it would get about a block away from the White House the engine would quit. What they finally figured out was when they used the radio to call and open the gate the high current from the radio wiring was running right along side the wires to the engine's controller.