I’m having trouble with my 2011 Mercury 40hp EFI outboard motor. It cranks and starts up just fine, but then it stalls out after a few seconds. I’m unsure what might be causing this issue. I’ve checked the basics, like ensuring there’s enough fuel and the battery is fully charged. I would really appreciate any help or suggestions on what could be causing the stalling problem and how to fix it. Thanks!
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You might want to check the Manifold Absolute Pressure (MAP) sensor and the Throttle Position Sensor (TPS). If either of these sensors is malfunctioning, it could cause your engine to stall shortly after starting. The MAP sensor should have a specific resistance, and the TPS should have a voltage range at idle and wide-open throttle. If you have a multimeter, you can check these values against the specifications in the service manual. I am not at the shop this weekend so I cannot tell you the specifications, but you can download a service manual at 911manual.com for your year and model engine. Also, listen for any warning beeps when you turn the key, as these can indicate sensor issues.
Thanks for the suggestions TaurusKing. I started by checking the wiring harness connections, and everything looked good there. Then, I tried cranking the engine several times to clear any air from the fuel lines, but the problem still persisted.
Finally, I checked the MAP and TPS sensors as you suggested. When I tested the MAP sensor, I found that the resistance was way off. I replaced the MAP sensor, and now the engine starts and runs smoothly without stalling.
I really appreciate all the help. This forum is a lifesaver!
Another possibility to consider is that there might be air in your fuel system lines. Air pockets can cause the engine to start and then stall shortly after. Try cranking and starting the engine several times to see if this helps clear any air out of the lines. If the problem persists, you might want to inspect the fuel lines and connections for any leaks that could be letting air into the system.
It sounds like you might have a poor connection in the wiring harness from the remote control to the engine. Sometimes, a loose or corroded connection can cause intermittent stalling issues. I’d recommend cleaning and inspecting all the male and female connections in the wiring harness. Make sure everything is tight and free from corrosion. This could solve your problem if it’s a connectivity issue.