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Have 1997 Four Winns with 5.7 GLI Volvo Penta motor. All the…

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Have 1997 Four Winns with...
Have 1997 Four Winns with 5.7 GLI Volvo Penta motor. All the plugs are black, puts out black smoke, and falls on its face when you give it full throttle on the water, but put it in neutral and it takes the fuel fine.
Submitted: 8 months ago.Category: Boat
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Answered in 52 minutes by:
9/8/2017
Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 months ago
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,203
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
Verified

Hello, I'm Tan. Welcome to JustAnswer. I'm reviewing your question and will reply momentarily.

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Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 months ago

Remove the flame arrestor and check that the choke plate is opening correctly.

Is the choke plate opening completely as engine warms up?

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Customer reply replied 8 months ago
there is no choke plate on this - electronic fuel injection
Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 months ago

Ok then we need to check fuel pressure.

If the fuel pressure is above spec this will cause spark plug fouling or if the ECT(engine control temp) sensor is bad it will make engine run rich. To find this you must connect to a scanner and read the engine codes.

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Customer reply replied 8 months ago
well I dont have a scanner. where is this sensor located at?
Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 months ago

The sensor will be near the t-stat housing with a 2 wire plug connecting to the sensor. The sensor reads the engine temperature so it is screwed in the the intake manifold or t-stat housing.

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Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 months ago

Here is what the switch looks like. This is the switch for your motor.http://www.ebay.com/itm/like/292004957194?chn=ps&dispItem=1

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Customer reply replied 8 months ago
we were using gasoline from the gas station up on the highway which contained ethanol. would that be a problem or cause anything to be a problem?
Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 months ago

It's possible the ethanol damaged the diaphram in the fuel pressure regulator. This will cause extremely high fuel pressure and cause the engine to run rich.

The fuel pressure spec is 31-39 psi at idle. The fuel pressure port is on the VST(vapor separator tank) TBI or on the fuel rail if MPI.

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Customer reply replied 8 months ago
ok, if this doesnt work, do we just get back with you on the website?
Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 months ago

Yes just post back as you have been. These are the 2 most common causes of black spark plug. Engine running to cool which can be a bad t-stat or the ECT reading wrong. Then too much fuel pressure which is the fuel pressure regulator failure.

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Customer reply replied 8 months ago
ok thank you
Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 months ago

Your welcome.

I hope I’ve provided the information you were seeking. If you are happy with my service, your 5-star rating at this time is most welcome. If you need more help, please let me know so l can continue to assist you.

Thank you......Tan

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Tan
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,203
11,203 Satisfied Customers
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

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