Speed problem-2006 260DA

Tonyhliu

New Member
Sep 17, 2019
19
Boat Info
2006 Sundancer 260DA
Engines
Mercuirser 350w/Bravo III
My boat only goes up to 8 miles even I push throttle all the way down. RPM -3k.
I googled maybe three problems: spun prop, debris around prop or maybe gas line leak.
Seems gas line is fine, so narrow down to two: spun and debris
Any good suggestions to easily identify the real problem? Or even maybe some other issues?
Engine runs okay at low RPM, but l feel louder than before, She sits in Long Beach for 5 months.
Just changed: two new batteries, a new onboard charger, a new water heater.
 

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You can rule out a spun prop on a Bravo III. They have solid props.
 
It’s late in the season. How much growth is on the hull?

Has it been sitting in the water unused for 5 months?

Raise your outdrive and inspect it for growth, post a picture if you can.
 
It’s late in the season. How much growth is on the hull?

Has it been sitting in the water unused for 5 months?

Raise your outdrive and inspect it for growth, post a picture if you can.
Yes, it’s been sitting water for 5 months, will try to get a picture.
 
Pull the boat out and clean the bottom.

And yes, we’d all love to see a picture of it before you clean it. You’ve probably got all kinds of nasty stuff growing on it.
 
Hired a diver Clean the bottom and prop. Run out and got a little good speed, but still max at 18 miles and 3.5k RPM.
Any suggestions?
 

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BTW, I changed the IAC valve because engine cannot start, it helps a little, but still have problem to start from cold engine, unless it’s warmed.
 

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-- Bad/old gas and/or water in gas
-- Check fuel pressure
 

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