Why do my spark plugs keep turning black?
Why do my spark plugs keep turning black? Black, dry soot on the electrodes and insulator tip indicates a carbon-fouled plug. This can be caused by a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture or idling your vehicle for too long. Where is the timing light on a Monte Carlo? Connect the timing light's power cables to the battery. Clip the timing light's sensor wire to the #1 cylinder spark plug wire (driver's side, front spark plug). An easy place to connect this is up by the distributor. Just make sure you have...