I have a 2011 mercury optimax 200hp. I was out fishing and on the way back in I lost around half the power and acceleration. So when I got home I changed the fuel filter and tried that but no improvement. So then I changed the spark plugs and put an injector cleaner in aswell and tried that but still no difference. What could be the problem. Thanks.

On 8/29/17 4:35 AM, wrote:
I have a 2011 mercury optimax 200hp. I was out fishing and on the way back in I lost around half the power and acceleration. So when I got home I changed the fuel filter and tried that but no improvement. So then I changed the spark plugs and put an injector cleaner in aswell and tried that but still no difference. What could be the problem. Thanks.


Fuel pump?

On 8/29/2017 7:47 AM, Keyser Soze wrote:
On 8/29/17 4:35 AM, wrote:
I have a 2011 mercury optimax 200hp. I was out fishing and on the way
back in I lost around half the power and acceleration. So when I got
home I changed the fuel filter and tried that but no improvement. So
then I changed the spark plugs and put an injector cleaner in aswell
and tried that but still no difference. What could be the problem.
Thanks.


Fuel pump?


Fuel tank vent plugged causing engine to starve for gas.

On Tue, 29 Aug 2017 01:35:26 -0700 (PDT),
wrote:

I have a 2011 mercury optimax 200hp. I was out fishing and on the way back in I lost around half the power and acceleration. So when I got home I changed the fuel filter and tried that but no improvement. So then I changed the spark plugs and put an injector cleaner in aswell and tried that but still no difference. What could be the problem. Thanks.

Optimax motors have a computer. Scan it for codes.

On Tuesday, August 29, 2017 at 12:53:00 PM UTC-4, wrote:
On Tue, 29 Aug 2017 01:35:26 -0700 (PDT),
wrote:

I have a 2011 mercury optimax 200hp. I was out fishing and on the way back in I lost around half the power and acceleration. So when I got home I changed the fuel filter and tried that but no improvement. So then I changed the spark plugs and put an injector cleaner in aswell and tried that but still no difference. What could be the problem. Thanks.

Optimax motors have a computer. Scan it for codes.

Do they use OBDC or do they have a proprietary system?

On 8/29/2017 1:38 PM, Keyser Soze wrote:
wrote:
On Tue, 29 Aug 2017 01:35:26 -0700 (PDT),
wrote:

I have a 2011 mercury optimax 200hp. I was out fishing and on the way
back in I lost around half the power and acceleration. So when I got
home I changed the fuel filter and tried that but no improvement. So
then I changed the spark plugs and put an injector cleaner in aswell and
tried that but still no difference. What could be the problem. Thanks.

Optimax motors have a computer. Scan it for codes.


So did luddite’s Nissan...



All kinds of info available on the 'net regarding "Guardian Mode" (aka
"limp home mode"), assuming that's the OP's problem.