Tips on how to Diagnose Mercruiser Engine Difficulties Basic Diagnostics1Attempt to activate your Mercruiser starter. If it'll not turn for the "on" position, your battery or starter solenoids are broken.2Examine the battery connectors and spark plugs of one's Mercruiser engine. When the connectors fit appropriately, they are not the problem. If the spark plugs are dented or cracked car diagnosis tool, replace them and try to start the Mercruiser again. If it still refuses to begin, the spark plugs usually are not the issue.3Look at the odometer to ascertain the rpm rate. When the rpm rate will not be running in the suspected speed, a damaged propeller hub or boat bottom would be the most likely complications.
Appear at the propeller hub and boat bottom to examine for harm. If they may be not damaged Auto code scanner, the rpm most likely signifies a clogged air filter or broken carburetor.4Allow the engine to warm for about 10 minutes. Open the engine cover and check the temperature gauge of your engine. Hold an engine thermometer subsequent towards the engine to ascertain when the temperature gauge is displaying an accurate temperature. If it's not precise, you have to change the gauge. If the temperature is as well high, however the gauge is precise, you must adjust your water pump impellers.5Flush your fuel system in case your boat does not start out. Clogged fuel systems can retain carburetors from functioning correctly.
Fill the tank with new fuel. When the boat nonetheless won't start, the fuel technique just isn't the problem.Scanner Tool6Open the engine situation and locate the four-pin connector that attaches for the scanner tool. Plug the tool in to the connector.7Press the arrows to navigate to "PCM Functions" and press the button that reads "Yes."8Use the arrow keys to select the "Auto Self Test" option and press the button that reads "Yes." Enable the scanner tool to scan the engine for problems. If the scanner finds an issue, it displays an error message. Make a note of your message.9Select "Output Tests" employing the arrows. Select the appropriate test, including Fuel Injectors or Tach Output and press "Yes." Permit the machine to scan the engine to establish when the element is running correctly.
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