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It has a fuel cell and a pump from a 98 mustang. 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. 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. Overheating Damage: Overheating spark plugs can cause the electrode to wear faster. Anything that causes a … In this instance, a case of hard starting was the result of carbon buildup on the plugs. 2. A visual inspection of your boat engine's sparkplugs can help you diagnose problems. 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). Joined Aug 28, 2010 Threads 105 Messages 1,805. The motor is getting fuel but the guy who did the swap said it was fouling the plugs because of the pump. This past weekend, I pulled the spark plug from cylinder #4 to check it. I can start and drive it up the street maybe 15 times before they foul out. By Kevin Falvey. Compare it to the new plug on the right. When your ATV keeps fouling spark plugs, there is likely an underlying issue that should be addressed before installing new plugs. Stuck open thermostat, again this causes the engine to run to cold. I went ahead and replaced all the plugs and wires at that time. Pre-ignition from an improperly timed engine can cause this, as can an incorrect air to fuel ratio. 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. When I got home, I pulled the plug and found it badly fouled as show in the attached picture. It might help you determine the cause of your fouling. The plug on the left is fouled with carbon. I will list all possible causes from most likely to least likely. No Air = No Combustion. Spark Plug Analysis - Technical Information - NGK Spark Plugs Australia . 3. Fouled spark plugs can cause engine misfiring, reduced engine power, poorer fuel economy, rough idling, increased emissions, … I looked up the psi and it is supposed to be 70-95 for a 280zx and the mustang is 95-105. Proper installation torque is critical in the plug’s ability to dissipate heat out of … S. SeniorCitizen Lawn Addict. I checked the code and got a P0304 - misfire in cylinder #4. Yet 90% of spark plug damage claims are due to improper torque. Cause: Air Intake Blockage. Oil Contamination: If oil seeps onto the spark plug, it will foul the tip. 1. Tips For Fouled Spark Plugs. (Source: Auto Success Online) Excessive idling, this causes the engine to run to cold. This rule goes for even the plugs that are pre-measured spacing. Ok I have an 83 280zx turbo and it is fouling plugs like crazy. 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. There are a couple of things that will cause premature fouling. Many factors can cause a spark plug to fail; from incorrect heat ranges to improper gapping, to chemical contamination. Sep 1, 2014 #4 At the top of the link list for fouled plugs is Air/fuel mixture (A/F) too rich. First thing to do if your spark plug has been fouled is to check the air filter. March 27, 2016. If this occurs a number of times after the spark plugs have been replaced, the engine is flooding with gasoline. And found it badly fouled as show in the attached picture the engine to run to cold might you! Result of carbon buildup on the right for even the plugs list all possible causes most! 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