MichaelIntoTheWild
New member
Hi all, I've got a 2007 model 115ph Optimax that has started playing up. Once it is up to operating temperature, it is losing all power when accelerating from idle. If I feed in the throttle slowly I can get it up onto the plane and it will run as normal. But if I apply throttle at a normal amount (or more) it starts to increase revs then just drops right out. It has never cut out and does not run rough at all - sounds smooth and normal regardless. It had done this once or twice randomly in the past but on the last trip out it was playing up every time I accelerated from idle. I've had it into the local Mercury workshop and they found no faults on the diagnostics. They did a bunch of tests and the only thing that failed was the spark plugs which they replaced. Back on the water the following day and I tested it out multiple times as soon as we left the marina with no problem. After a 10 minute cruise, I pulled back to idle for a couple of minutes, then tried to throttle up again and the it again lost all power/revs. Turned around to head back in and again managed to get it up to speed by accelerating very slowly. Im suspecting fuel system but am a little stumped - as is the mechanic. Any help would be greatly appreciated. Thanks.