2008 mercury 175 OptiMax

[hgvoce]

So at low throttle, not on plan just plowing through the water after about a minute or so the guardian system alarm goes off and I lose power IF I keep plowing on. (like did not hear the alarm) Runs great at full throttle or mid throttle once on plane just this issue at low speed. The system recovers as soon as I throttle back or power off and back on. Spoke with a local mechanic and he said it could be a fuel pressure problem. I was watching the motor in this setup and the water out the pee hole appears strong.

Any ideas? Only had ethanol free gas BTW

 

[floridaboy101]

Re: 2008 mercury 175 OptiMax

So at low throttle, not on plan just plowing through the water after about a minute or so the guardian system alarm goes off and I lose power IF I keep plowing on. (like did not hear the alarm) Runs great at full throttle or mid throttle once on plane just this issue at low speed. The system recovers as soon as I throttle back or power off and back on. Spoke with a local mechanic and he said it could be a fuel pressure problem. I was watching the motor in this setup and the water out the pee hole appears strong.

Any ideas? Only had ethanol free gas BTW

Have about the same issue on mine and it is a 90hp

 

[bilge rat jim]

Re: 2008 mercury 175 OptiMax

What alarm code (how many beeps)?

 

[hgvoce]

Re: 2008 mercury 175 OptiMax

solid tone, no beeps

 

[Rodgers1995]

I have the same problem with mine. Anybody know what the solution is?

 

[Rodgers1995]

I have the same problem with mine. Anybody know what the solution is?

 

[schematic]

I would check for:
-weak water pump
-clogged or lazy thermostat (doesn't open fully)
-sticking/clogged poppet valve

 

[tlh 178]

I would check for:
-weak water pump
-clogged or lazy thermostat (doesn't open fully)
-sticking/clogged poppet valve

i had the same problem, i replaced all three as stated above. not sure which one was bad. but all is well now!

 

[GA_Boater]

All this posting in an old topic. Closed.