2006 Mercury 150hp efi oil injected saltwater series

Hi Everyone, my first post, and I'm an Aussie!!!

I have the 2 stroke efi oil injected 150hp Mercury saltwater series.
On first start up it is smoky, which clears when in gear and running. At speed it runs fine.

I was fishing solo around 15 mile offshore and I started the engine and let it idle for 15 minutes to charge the batteries. But it appeared to foul the plugs as it started to splutter and misfire.

I decided to leave the fish biting and return to the mainland. After 10 minutes of under load running, it ran smooth again.

I use the Mercury synthetic oil and good quality fuel.
Any ideas on possible things to check???

Thanks !!!

Either injector problem/s or oil tank building to much pressure filling VST overrich. The pressure fitting may be acting up. Its on the block just follow hoses from oil tank in boat.

faztbullet said:

Either injector problem/s or oil tank building to much pressure filling VST overrich. The pressure fitting may be acting up. Its on the block just follow hoses from oil tank in boat.

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Thanks!
I'm thinking there is too much oil, so I will check out the oil side of things first.

If it was fuel related it would break down worse under load, but at full noise it runs smooth.

I think the plugs are oiling up when it idles due to too much oil.