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"Wet" Spark Plugs

The cause of "wet" spark plugs, ignition wiring, and engine stalling depends on what you mean by wet.

Your use of the terms wet AND stall suggest that you mean water on the outside of the plugs and on the spark plug wires.

If you are talking about external wetness with water, then the cause is usually one of two things:

  • Water from a wet roadway has splashed "up" into the engine compartment and caused the plugs and ignition wiring to be wet, or
  • A combination of temperature and humidity in the atmosphere has resulted in condensation of water vapor on the plugs and wires.

In either case, the result is misfiring, rough running, and in the worst case scenario, even stalling.

IF on the other hand, by wet you mean liquid fouling of the spark plug terminals inside the engine, this is usually caused by one of two other things:

  • Too much fuel getting to the cylinders, or
  • Crankcase oil leaking into the cylinders, caused by worn or broken piston oil rings.
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Q: Why would your spark plugs get wet and car stall?
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