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Merc 50hp 4stroke EFI 50hp mystery issue

Paul173

New member
Hi everyone,

Would love some direction on an ongoing issue with my motor. The model is in the title. Just for some background I've recently replaced the battery, changed the spark plugs, changed the oil, changed the oil filter, gear oil and replaced one of the fuel filters (low pressure).

But even still the issue persists. Basically every now and then the motor will start sputtering and shaking as though its running out of fuel (plenty of fuel and the bulb is solid). This will happen only at idle and generally straight after ignition. When throttle is applied at this stage it will jerkily push forwards until eventually turning off. It doesn't happen ever once I get the motor on higher revs. It's baffling because it doesn't follow a pattern. Eventually I can get it running again after waiting a while but sometimes it still persists.

I have a video but can't attach it.

If anyone has any suggestions I'll greatly appreciate it!

Thanks
Paul
 
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