Hi,
I have an old boat with a twin instalation of KAMD44P-C with zf gearboxes and shafts. Sometimes when boat engines are engaged in forward the starboard engine starts to rush up and down in rpm.
Last year this happend early in the spring and then it worked fine for 100 running hours on the engines. This year it happens more frequently. When it happends I stop both engines and try to run with one engine at the time.
Each engine then runs like normal - Also the starboard engine which the issue occurs. I then start both engine again and sometimes both function normal and sometimes the starboard engine continue with rushin up and down in rpm.
I.e I am running both engines at 2000 rpm and the starboard will go from 1800 to 2200 rpm. I suspect an EDC / electronic issue but I hope sombody here can help me for further troubleshooting and hopefully define the problem.

 

Hello, did you have any error code from EDC panel?

 

No codes

 

You have a turbosensor connected to the EDC box. Or it can be inside the edc box.

In the autumn, there will be condensation in the pressure hose to the EDC box. This water destroys the turbo sensor and produces the result you describe. These hoses should be loosened and dipped in water at regular intervals when it is cool outside.

 

Thanks - will try!