No low end and low WOT rpm's

[nwaccstudent@yahoo.com]

I recently bought a 2011 stingray with 4.3 Volvo with 13 original hours on it (it sat for a couple years). It starts and runs, but takes forever to plane out (30-60 seconds). Once it planes out (somewhere around 2800-3000 rpm), it has a very responsive throttle, runs great, lots of power. It tops out at 4000 - 4200 rpm, but it should run up to 4600-4800 at WOT. I have replaced the fuel and fuel filters, I have run two tanks of fuel with sea foam fuel treatment as well as putting lucas fuel treatment directly into the fuel filter (50-50 ratio with fuel) and there has been no change in performance. It also is flooding after it sits for a few minutes between run times. I have to use the fast throttle feature while cranking to clean out the fuel chamber before it will start again. This is a fuel infected engine. I would be interested in some advice on how to address this issue. Thanks!!

​Donny

 

[rs1lollie]

give it a tune up (plugs,plug wires,cap and rotor)

 

[bajaunderground]

I ... This is a fuel infected engine...
​Donny

​Aren't all boats fuel infected? lol.

Why'd the PO sell?

Did you gain any elevation from where you purchased? Might be wrong prop for altitude<---(that's just a guess)? I would tune-up (as stated), run the highest octane fuel you can (the lower octane stuff at my elevation has been known to boil at 90* (85 Octane) with 10% ethanol.

 

[Scott Danforth]

If it is fuel injected and not carbureted, and it is flooding between runs, I would look at leaking or damaged injectors.

If it simply starts hard, or takes a while to start between runs look at the fuel cell itself

 

[89retta]

What size prop do you have on your boat?

 

[jimmbo]

This is a fuel infected engine.

LOL:lol:
Welcome to iboats

First what pitch is the propeller, and what is the gear ratio? The gear ratio should be on a tab on the outdrive. I suspect it will be1.79:1. What was your top speed with your current prop? I believe the RPM range for FI should be either 4600 - 5000 or 4800 - 5200. But before you start changing props, check to see if you have spark on all cylinders. You may very well have dirty or stuck open injector. That is a throttle body system? Easy enough to change the injectors.