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Skipper
Posts: 13
Registered: ‎06-10-2020

e-Tec 90HP 2009 - coughing at quick RPM increase

[ Edited ]

Help!

 

We have run this motor for a few years without any issues, but this year when going for the first run it showed up a strange behaviour.

 

It start at first try as always and sound just like expected.

 

Slow throttle increase (ramping up speed slowly over 30 seconds from slow to max), it behave as expected and deliver full power taking us to about 30 knots with our RYDS 525C

 

However, when giving it a quick throttle from slow to max speed, it start to chocke and cough and stay at about 1500 RPM and sound like it miss ignite or something like that, running on one cylinder..... Im not so much into engines, but I can imagine this would be a result of that.

 

Anyone have experience with this? What can it be? Would could be done about it?

 

I uploaded a video on my profile showing the engine begavour if that helps.

 

Any support is highly appreciated, I miss the normal response from my motor Smiley Happy

 

Thanks,

 

Lars

 

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Captain
Posts: 270
Registered: ‎08-11-2011

Re: e-Tec 90HP 2009 - coughing at quick RPM increase

Sticking neutral switch?

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Skipper
Posts: 13
Registered: ‎06-10-2020

Re: e-Tec 90HP 2009 - coughing at quick RPM increase

Best Nordmann,

 

I don´t belive so as it´s very consistent in the behaviour. If I just ramp up the speed slowly it always work great. If I do it rapidly it behaves as in the attached movie and stop at 1600 RPM.

 

So I belive it´s more related to electronics than a stickning switch.

 

But I will for sure look into it.

 

Thanks for your input!

 

Lars

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Captain
Posts: 843
Registered: ‎08-20-2017

Re: e-Tec 90HP 2009 - coughing at quick RPM increase

Around 1600 is the neutral rev limiter. The engine will shut off cylinders to limit speed. The shift switch has a plastic plunger which could stick and take a couple of seconds to release.
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Skipper
Posts: 13
Registered: ‎06-10-2020

Re: e-Tec 90HP 2009 - coughing at quick RPM increase

Thank you!

 

Im starting to get convinced Smiley Happy

 

Could you advice where to find this part so that I can see if it hangs up?

 

Should I put some grease on it to make it go smother?

 

A pitcture to share if you have one?

 

Many thanks in advance,

 

Lars

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Captain
Posts: 843
Registered: ‎08-20-2017

Re: e-Tec 90HP 2009 - coughing at quick RPM increase

Lars, starboard side at the bottom of the shift lever. Black plastic switch about 25mm long. Liquid spray, no grease. Is a plastic plunger in a plastic housing. Grease, engine oil leaks, or anti corrosion spray will cause this switch to stick.
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Skipper
Posts: 13
Registered: ‎06-10-2020

Re: e-Tec 90HP 2009 - coughing at quick RPM increase

Thank you for all input. Problem still remains. I don´t belive it´s related to the swithc...thinking that the boat is moving forward so it´s not in idle running. As soon as it has run for 5-10 minutes and is getting up to temperature it starts to behave as expected again ang gives full power as quick RPM increase.

 

Took a few new videos of the behaviour without the top on as the sound is more distinqed sound

 

Any new input based on new data is highly appreciated!

 

20200620_105543.jpg

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Captain
Posts: 270
Registered: ‎08-11-2011

Re: e-Tec 90HP 2009 - coughing at quick RPM increase

Did you replace the switch?

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Skipper
Posts: 13
Registered: ‎06-10-2020

Re: e-Tec 90HP 2009 - coughing at quick RPM increase

I figured it can't be the switch as the boat is moving it can't be in neutral. Make sense?
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Captain
Posts: 270
Registered: ‎08-11-2011

Re: e-Tec 90HP 2009 - coughing at quick RPM increase

[I figured it can't be the switch as the boat is moving it can't be in neutral. Make sense?]

 

NO.