How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dominick Your Own Question
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
Type Your Boat Question Here...
Dominick is online now
A new question is answered every 9 seconds

Owner of marine specialty in KS. I have a volvo 8.1l gsi the

Customer Question

Hi there I am Jerret Kubick owner of marine specialty in wilson KS. I have a volvo 8.1l gsi the is poping in the intake. I pulled the spark plugs and number eight was black and sooty as heck. Number 7 the same but not as bad. replaced all pugs and number 8 coil. still poping when you throttle up. I am wondering if it could be valves or something compression was all even.
Submitted: 2 years ago.
Category: Boat
Expert:  Jason replied 2 years ago.

Hi Jerret, my name is Jason.

What were your compression numbers?

Have you thrown a vacuum gauge on the engine to see if there was any flutter?

Does it pop at idle, or only when you throttle up?

Customer: replied 2 years ago.
when you throttle up.
where to hook vacuum gauge?
i am looking for the numbers
Expert:  Jason replied 2 years ago.

You could unplug the fuel pressure regulator and stick the vacuum gauge on that hose

How old is the gas in the boat, and have you run it on another fuel supply yet? Also, have you checked fuel pressure?

Customer: replied 2 years ago.
I have not checked fuel pressure. fuel is fresh.
Expert:  Jason replied 2 years ago.

Let me know what you get for compression numbers. After that, hook up a fuel pressure gauge and duplicate the problem, and see what it's running for fuel pressure and let me know about that as well.

Related Boat Questions