Engine light and beep

[Jrshrpe]

Hi Y’all, I have a 2011 Larson 258 with the Volvo Penta 5.7 GIC. Started getting the eng indication and beeping about a min after getting on plane then eng reverts to safe mode. Temp, press all look good.
The port riser seemed a little hotter than the other but gauge temp was good around 165-170*.
No leaks or anything detected.
Any ideas???
The engine would run fine at idle. Only get the light and beep at higher RPMs.
I’m suspecting a temp sensor somewhere or maybe a slight blockage in the port riser or something down stream of the thermostat.

 

[bruceb58]

One riser will always be hotter than the other.

In order to determine which sensor was causing this, you would have to disconnect the wire from one of them at a time and either ground it or keep it open, depending on how they work.

When was the last time you changed your water pump impeller?

 

[Jrshrpe]

The impeller is new. But, wouldn’t a bad impeller cause the water temp gauge to show Hot?
The problem only occurs during higher power settings.

 

[larson260]

When was the last time the manifolds and elbows replaced

 

[Jrshrpe]

I was thinking possibly it could be manifolds since they are original. Was hoping it is something less evasive. Maybe a bad sensor somewhere. There’s four O2 sensors and temp sensors. A code reader may help isolate the problem but that means mechanic fees.

 

[larson260]

10 Years on manifolds and elbows is really exceeding the manufactures 5 year window. Are you in fresh or salt water? Do you have cats? Its not a bad idea to scan for codes. Lets us know what the out come is.

 

[Jrshrpe]

Has been in salt for a couple years but thoroughly flushed after use.
It’s probably time to change manifolds.
I’ll keep you posted.