Mercury 75 hp 4 stroke idle problem

[Michaeljf]

The motor runs at a high idle. It runs at 2500rpm. When I back it down, it kills. I have checked the fuel flow and it is good. I Tried new gas, new plugs and stills idle rough. This motor is fuel injected

 

[sxmerc]

Re: Mercury 75 hp 4 stroke idle problem

Contaminated carbs my friend. Unfortunately you should take this one to a Merc shop. Even if you clean the carbs yourself, you will need a special vacuum tool to set the motor up correctly.

 

[Michaeljf]

Re: Mercury 75 hp 4 stroke idle problem

Thanks but the engine is fuel injected

 

[sxmerc]

Re: Mercury 75 hp 4 stroke idle problem

Sorry. I missed that part of your post. The fuel injected versions have also had a few issues with the floats in the float chamber.