2009 Mercury 200 EFI 2 stroke lost spark

_FrosT_

Junior Member
Joined
Jul 6, 2026
Messages
5
Location
Lake District
Hello knowledgeable people. Just rigged up my phantom 18 with a Merc 200 EFI. The engine was sound when it was on a rib before but I put it on my phantom, first time out it felt way down on power and wouldn't want to get to higher RPMs under load (revd fine in idle). Swapped props to see if thats what it was and it helped a little but but then it started pulsing power, going up and down 3-4 mph at full throttle and you could really feel the pulsing. Shortly after it flagged up a throttle position sensor fault on the gauge and on the bluetooth dongle I got a 341-6 TPS adapt A fault. Swapped the TPS out to a know good one, took it back out the next day and getting the same error and stalling at idle but ran the same under throttle with the pulsing. This was then followed by a sudden engine off and full throttle, engine lost all spark and would not re-start. Checked kill cords are all good, getting fuel and oil but no spark on any cylinders. Any ideas on where to start? Is there a good diagnostic tool that might offer in depth diag? There is no current faults showing but the engine will not start
 
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