The W.A.V.E.
New Member
I really need help so I hope there is someone here who can help me:smt100
After splashing a few weeks ago my starboard engine has not been able to maintain an rpm above 12-1300. It will go as high as 3800 when taking off to plane but falls on its face within seconds. I have tried taking off and maintaining 2000 rpm's and it will do it for approximately 2 to 3 minutes then falls back and surges between 700 and 1500 until it finally wont go over 1000 rpm's.
What I have done so far:
Changed plugs, plug wires cap and rotor
Changed fuel filter....gas in the filter looked clean with no water
swapped coil from good port engine to problem starboard engine
I checked spark afterwards and all plugs are showing a good spark and plugs when removed looked good. They were about 30 hours old.
Tonight I just bought a new electric fuel pump. Not sure if that will fix it or not. When I put a gauge on the fuel rail it showed 36-38 lbs. I havent checked it when under load ie. trying to get on plane.
Any ideas would be helpful, if the fuel pump doesnt fix it the next step I think Ill take is having the tank emptied and cleaned. If that doesnt work its time for a mechanic and possibly a look at the injectors. Thank you for any help anyone can provide!! My boat is a 1999 Sea Ray 340 with twin 7.4 mpi engines with v drives.
After splashing a few weeks ago my starboard engine has not been able to maintain an rpm above 12-1300. It will go as high as 3800 when taking off to plane but falls on its face within seconds. I have tried taking off and maintaining 2000 rpm's and it will do it for approximately 2 to 3 minutes then falls back and surges between 700 and 1500 until it finally wont go over 1000 rpm's.
What I have done so far:
Changed plugs, plug wires cap and rotor
Changed fuel filter....gas in the filter looked clean with no water
swapped coil from good port engine to problem starboard engine
I checked spark afterwards and all plugs are showing a good spark and plugs when removed looked good. They were about 30 hours old.
Tonight I just bought a new electric fuel pump. Not sure if that will fix it or not. When I put a gauge on the fuel rail it showed 36-38 lbs. I havent checked it when under load ie. trying to get on plane.
Any ideas would be helpful, if the fuel pump doesnt fix it the next step I think Ill take is having the tank emptied and cleaned. If that doesnt work its time for a mechanic and possibly a look at the injectors. Thank you for any help anyone can provide!! My boat is a 1999 Sea Ray 340 with twin 7.4 mpi engines with v drives.
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