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Mercruiser 5.7 Acceleration Issue

scott821553

New member
I recently rebuilt a Mercruiser 5.7 for a 1998 Sea Ray 230. The engine is running great (starting, idle, after accelerating) except for accelerating out of the hole.
  • If you try and go full throttle from idle the engine will bog down and not really go much above idle. When you pull it back to idle the engine will die.
  • If you accelerate slowly, but still too fast, the boat will gain some speed but then start to bog down and backfire.
  • If you accelerate slowly, to about a quarter throttle, and then wait - the boat will hesitate for about 5-10 seconds but then start to accelerate (without moving the throttle position) normally. After this point there are no issues accelerating to full throttle and the engine runs great.
  • This issue seems to only happen under load (does not do it when the throttle is moved up and the boat is not in gear).

Any thoughts or suggestion on what to check?
 
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