Your ignition coil pack has three coils that each fire two spark plugs, one on each side. If either spark plug is disconnected, neither of those two will fire, so the engine won't run. Spark is going to try to jump from the disconnected wire to the engine block. If it is successful, the mating spark plug might fire. That could allow the engine to try to run on one, two, or three cylinders. Carbon-tracking will develop in the spark plug boot(s) where the arcing occurred. That carbon-tracking conducts current and once those wires are reconnected, will allow the spark voltage to be shorted to ground rather than jump the gap on the spark plugs. You can end up with a misfire that won't clear up until the spark plug wires, and possibly the spark plugs are replaced. Those misfires may not show up right away. That could take a few miles to a few days.
If spark was not able to arc to the engine block, there may be no problem now. Just reconnect the wires and see how the engine runs.
Thursday, June 11th, 2015 AT 6:51 PM