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Why Does My 2011 Mercury 40hp EFI Stall After Starting?
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 raRead more
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.
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