Volvo Penta 454 engine trouble

[RickKennedy]

I hope someone knows something. I've been trying everything for a few weeks now.

my Volvo runs great for about 15 minutes and then runs really really rough.

my testing has ruled our the carburetor, the actual fuel, the cap and rotor and the fuel pump. What's left? electrical???? anybody???

Thank you,

Rick

 

[dubs283]

Re: Volvo Penta 454 engine trouble

have you changed/looked at any of the fuel filters??

 

[Bifflefan]

Re: Volvo Penta 454 engine trouble

The coil?
After it heats up it can be shorting internaly or not performing correctly.

 

[RickKennedy]

Re: Volvo Penta 454 engine trouble

I'll check that next. Thank you.

 

[RickKennedy]

Re: Volvo Penta 454 engine trouble

I did change all the filters. I will check the coil next.

 

[bruceb58]

Re: Volvo Penta 454 engine trouble

What are you working on? Need more than just 454 Volvo.

 

[RickKennedy]

Re: Volvo Penta 454 engine trouble

I hooked up a spare fuel tank to eliminate fuel quality and restriction.

Fuel pressure checks out.

Hooked up another coil.

Changed the spark plugs, cap and rotor and module

Rebuilt the Carb

Puzzling how it runs great for about 15 minutes with all the above checking out.

The motor is on a 1996 26' Albemarle - single 7.4 GL 300 Horse Volvo Penta jackshaft