Proper installation torque is critical in the plug’s ability to dissipate heat out of … Sep 1, 2014 #4 At the top of the link list for fouled plugs is Air/fuel mixture (A/F) too rich. Cause: Air Intake Blockage. A visual inspection of your boat engine's sparkplugs can help you diagnose problems. S. SeniorCitizen Lawn Addict. Anything that causes a … 3. Excessive idling, this causes the engine to run to cold. Oil Contamination: If oil seeps onto the spark plug, it will foul the tip. The most common reasons why your dirt bike has a fouled spark plug are because a dirty air filter, improper pre-mix ratio, carb jetting is too rich, the engine has low compression, or a weak spark. Spark Plug Analysis - Technical Information - NGK Spark Plugs Australia . Many factors can cause a spark plug to fail; from incorrect heat ranges to improper gapping, to chemical contamination. 1. I can start and drive it up the street maybe 15 times before they foul out. There are a couple of things that will cause premature fouling. When your ATV keeps fouling spark plugs, there is likely an underlying issue that should be addressed before installing new plugs. This past weekend, I pulled the spark plug from cylinder #4 to check it. No Air = No Combustion. If this occurs a number of times after the spark plugs have been replaced, the engine is flooding with gasoline. Overheating Damage: Overheating spark plugs can cause the electrode to wear faster. 2. Ok I have an 83 280zx turbo and it is fouling plugs like crazy. (Source: Auto Success Online) Tips For Fouled Spark Plugs. I looked up the psi and it is supposed to be 70-95 for a 280zx and the mustang is 95-105. If the spark plug is fouling because of a carbon build-up, the reason is likely due to the combustion system of the lawn mower’s engine. The plug on the left is fouled with carbon. Compare it to the new plug on the right. I will list all possible causes from most likely to least likely. The most common reason for the fuel combustion system to cause carbon build-up on the spark plug is a failed mixture of fuel and oxygen. It has a fuel cell and a pump from a 98 mustang. I checked the code and got a P0304 - misfire in cylinder #4. Yet 90% of spark plug damage claims are due to improper torque. Pre-ignition from an improperly timed engine can cause this, as can an incorrect air to fuel ratio. Stuck open thermostat, again this causes the engine to run to cold. In this instance, a case of hard starting was the result of carbon buildup on the plugs. This rule goes for even the plugs that are pre-measured spacing. March 27, 2016. By Kevin Falvey. Joined Aug 28, 2010 Threads 105 Messages 1,805. It might help you determine the cause of your fouling. Other then that check your distributer cap and also spark plug wires if you keep having spark problems (also depending on your vehicle that type of spark plug wires can cause issues if they're not using tolerances that are equal to OEM). Fouled spark plugs can cause engine misfiring, reduced engine power, poorer fuel economy, rough idling, increased emissions, … First thing to do if your spark plug has been fouled is to check the air filter. When I got home, I pulled the plug and found it badly fouled as show in the attached picture. Most often fouled spark plugs are noticed when the engine starts fine, runs fine for a while, but then bogs down, starts to lose RPM, and dies. The motor is getting fuel but the guy who did the swap said it was fouling the plugs because of the pump. 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