A wet spark plug can be the result of the engine flooding. Flooding is what happens when you try to start the engine several times without it firing up. You can clean the spark plugs or you can just wait for them to dry out.
After periods of wet and windy weather, condensation and moisture can develop on your car's spark plugs, and other areas of the engine. If this moisture is ignored, permanent damage can occur to your car – leading to expensive repairs.
If your spark plug is wet there would be a current flow throughout the body of the spark plug and air-fuel mixture wouldn't ignite. To dry your spark plug soak the wet spark plug in petro,lallow it to dry and plug it to the engine.
Spark plugs that are covered in oil and/or ash deposits can prevent the engine from getting proper spark. Spark plugs that are covered in oil and/or ash deposits can prevent the engine from getting proper spark, resulting in a misfire.
Wet/Fouled Spark Plugs
If an engine becomes severely flooded, it may result in fouled spark plugs. A fouled spark plug is when the ends of the spark plug get wet due to an excess amount of fuel in the system.
No longer necessary as modern spark plug coatings work as a releasing agent and should be installed dry. Anti-seize can alter the tightening torque up to 20%, increasing the risk of breakage. Anti-seize can create heat transfer and electrical conductivity concerns. Only use anti-seize where it is OE recommended.
Dry out the wet electrical outlet
Avoid touching a wet outlet directly. For minor water damage, either allow the outlets to dry overnight or use a blow dryer to expedite the process. It is recommended not to use the outlet until an electrician has assessed it.
Lubricate Spark Plugs & Other Parts
For part of your car repair and maintenance, you can use WD-40 to remove carbon residue, and keep moisture away from spark plugs and spark plug wires. “WD” stands for Water Displacement.
This happens when there's too much gas and not enough oxygen in the engine, causing the spark plugs to get wet and making it difficult to ignite the fuel. This is one of the most common problems for carbureted cars.
In your case, what's happening is that the moisture that's stuck inside the distributor cap is compromising your spark. The spark is sufficient when all the other conditions are perfect, but once rain or moist air steal additional energy via the old spark plug wires, the engine starts misfiring.
You can clean a fouled spark plug and reuse it, but it might not function as well after that. If your spark plug is too worn or dirty to clean easily, you'll need to replace it.
It is best to wait for the outlet to dry naturally. If the water damage is not too bad, a period of 10-12 hours might be sufficient drying time. You can also position air blowers, or hair dryers (blasting cold air preferably) to let it dry out faster.
A spark plug usually lasts about 30,000 miles, but cleaning them and maintaining them periodically lets your engine perform better and increases your plugs' lifespan. If you see rust, carbon, gunk, dust, or any type of buildup during the inspection, it may be time to clean them.
Oil making its way into the spark plug wells will drastically affect the engines performance, leading to misfires, increased oil consumption and blue exhaust. In extreme cases, it can even lead to an engine fire. If the vehicle is exhibiting any of these symptoms, the spark plugs should be inspected immediately.
Make sure your car's engine is cold before you start. Spark plugs get very hot – only remove the spark plugs when the engine is cool to the touch. It can take a few hours for an engine to cool.
This silver or chrome-colored finish on the threads is designed to provide corrosion resistance against moisture and chemicals. The coating also acts as a release agent during spark plug removal. NGK spark plugs are installed at the factory dry, without lubrication or anti-seize.
Is Dielectric Grease Necessary for Spark Plugs? Strictly speaking, dielectric grease is not necessary for spark plugs to function; however, as noted above, it is a cheap, easy-to-use material that helps ensure the current moves through the spark plug into the ignition system.
Causes of a carbon-fouled spark plug include a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture, dirty fuel injectors or idling your vehicle for too long.
Overtightening the plugs can cause the shell of the plug to stretch, which will break the gas seals and lead to pre-ignition, or detonation. Furthermore, too much torque can cause the ceramic insulator to become loose in the metal shell and possibly eject from the cylinder head while the engine is running.
Scratched and broken spark plugs usually indicate that there is a foreign object in your engine. Meanwhile, split or chipped spark plug insulators are a sign of pre-detonation. Check for ignition timing faults, engine overheating, a faulty EGR valve or a clogged combustion chamber.
A leak from your O-rings or the spark plug tube seal is usually the main culprit behind the oil on spark plugs. The spark plug tube seals keep your spark plugs dry by keeping engine oil and coolant out. Failing O-rings can cause engine oil to leak into your spark plug well and onto your spark plugs.