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5.7 GXI makes horrible bogging sound - loss of power

jid

Contributing Member
2003 Volvo GxI in my 6500lb cabin cruiser (four winns vista 268).

Weird bog / deep exhaust sound when hitting the throttle:


Last couple of times out, when I’d it the throttle hard to launch, the motor starts to rev and then a horrible bassy exhaust-type OOOOOMMPH occurs. And no power. If I back off and then ease into the throttle slowly (like really slowly) then it doesn’t happen. It happened once after a long day. It is happening more and more including yesterday. If I ease in slowly I can still get up on plane and even WOT. Just can’t get to it fast.

if I ease into/through it and get on plane, it is ok. And it will WOT all day once it is up there.

ive replaced the spark plugs and the fuel pumps and it still does the same thing. Since the boat is in the water I wasn’t able to see if I have exhaust flaps that melted off or not. But that is my next peek.

Any other ideas on what it could be? Boat has been pretty much flawless until now.


 
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