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Misfiring Suzuki outboard DF 70 4 strokes

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philoudent

New member
Hello everybody, I'm new on this forum and i hope you can help me with my engine problem
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I took a video, the sound isn't perfect but you can see what happens


Misfiring starts at 5 minutes running, no matter the engine rpm. they stop when i slow down at 3000 rpm. There is none alarm

The motor is a second hand, built in 2008.

Trying to fix it we :
- did computer diagnosis ( no failure)
-changed all filters (oil, air, water separator)
- put additives in fuel like water remover and injectors cleaner
- cleaned fuel injection rail and injectors manually
- controlled high pressure fuel filter

Despite it none amelioration
Does anyone has an idea ? We're trying to think to everything, temperature, pressure, electricity, defective part ... Our local mechanic is thinking about a bad contact in the vapor separator tank. We're waiting for a new cable ....

Thanks for your help
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It is possible that it starts once the motor is warm and the metal expands causing a vacuum leak. Once it starts happening, spray around the intake manifold with something suitable and see if you hear a change in the idle speed.

Stuart
 
Hi ; thanks for your help. Things get better today after i repaired the primer pump. Misfiring started at 5000 rpm's. There was a vacuum leak on the pump. Tomorrow i'll replace it. I hope the problem will be resolved

I'll give you news tomorrow
 
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