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2006/2006 Yamaha 200 HP 4-Stroke Engine Problems

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  • denniscauwenberghs
    started a topic 2006/2006 Yamaha 200 HP 4-Stroke Engine Problems

    2006/2006 Yamaha 200 HP 4-Stroke Engine Problems

    Ok, listen up can anyone offer some information or assistance with this motor. Started about two months ago, engine was running fine and smooth then would intermittently upon acceleration engine shut off and stalled. Then will turn over and not restart. Took to mechanic(one I trust), have already cleaned high pressure fuel pump, replaced filters in all injector pumps, replaced all fuel filters, and no contamination observed/witnessed. Water pump and thermostats replaced $$$$ water pressure while running is between 10-20lbs. Engine oil and filter serviced, as well as, lower unit. Upon leaving the mechanics this morning, he stated that he had ran it for an hour at the shop with no issues. We went three miles down the road, ran it around a lake for about ten minutes, full speed and shut it off, and started right back up. Then drove an hour and half home and put in the St Johns, we ran it full WOT for about thirty minutes and decided to try fishing for a bit. Shut it off, used the trolling motor for about fifteen minutes then was going to run to another spot. Took off and got onto a plane and then fail on its face, stalled and shut-off. Thank heavens we had the trolling motor to get us back to boat ramp. Drove twenty minutes home, hooked it up to the hose and it ran fine. Any ideas on what the heck is going on, dont trust this motor anymore. Purchased it brand new and never had any problems, kept up with all the regular scheduled maintenance. Please offer any ideas....dazed and confused

  • seahorse5
    replied
    Re: 2006/2006 Yamaha 200 HP 4-Stroke Engine Problems

    Check fuel pump pressures when you accelerate and run at slow speeds.

    Test boat's fuel system with clear fuel line temporarily installed on lift pump inlet and Tee in a vacuum gauge

    test the check valve between the electric lift pump and VST

    Leave a comment:


  • denniscauwenberghs
    replied
    Re: 2006/2006 Yamaha 200 HP 4-Stroke Engine Problems

    Originally posted by theoldwizard1 View Post
    Intermittent problems are always a pain to resolve !

    I agree in general with 99yam40, sounds like it is starving for fuel. The obvious place to check is the vacuum side of the lift fuel pump, but if pumping the bulb has no effect, you should be good.

    I am not familiar with that specific engine, but the EFI system on it is almost identical to EFI and all modern cars and pickups. To rule out fuel completely, you need to verify "fuel rail pressure" next time this occurs. Most EFI system have a "port" (typically a Schrader valve) on the fuel line between the electric pump and the injectors where you can connect a fuel pressure gauge. You need to locate this port.

    You don't necessarily have to have a fuel pressure gauge with you to verify proper operation. If you can somehow open the port (press the little center pin of the Schrader valve) while cranking, you should get a healthy squirt of fuel.

    If not, the electric fuel pump is cutting out, the needle valve in the electric fuel pump chamber is stuck closed (not likely) or the lift pump has stopped working. Again, not that familiar with that specific engine, but many EFI systems use a fuel pressure regulator to insure a constant pressure between the intake manifold and the injector. This regulator "senses" intake manifold pressure and could generate incorrect fuel pressure.
    "OK, going to check this and let you know, thanks for taking the time to help me out!!!"

    Leave a comment:


  • theoldwizard1
    replied
    Re: 2006/2006 Yamaha 200 HP 4-Stroke Engine Problems

    Intermittent problems are always a pain to resolve !

    I agree in general with 99yam40, sounds like it is starving for fuel. The obvious place to check is the vacuum side of the lift fuel pump, but if pumping the bulb has no effect, you should be good.

    I am not familiar with that specific engine, but the EFI system on it is almost identical to EFI and all modern cars and pickups. To rule out fuel completely, you need to verify "fuel rail pressure" next time this occurs. Most EFI system have a "port" (typically a Schrader valve) on the fuel line between the electric pump and the injectors where you can connect a fuel pressure gauge. You need to locate this port.

    You don't necessarily have to have a fuel pressure gauge with you to verify proper operation. If you can somehow open the port (press the little center pin of the Schrader valve) while cranking, you should get a healthy squirt of fuel.

    If not, the electric fuel pump is cutting out, the needle valve in the electric fuel pump chamber is stuck closed (not likely) or the lift pump has stopped working. Again, not that familiar with that specific engine, but many EFI systems use a fuel pressure regulator to insure a constant pressure between the intake manifold and the injector. This regulator "senses" intake manifold pressure and could generate incorrect fuel pressure.

    Leave a comment:


  • denniscauwenberghs
    replied
    Re: 2006/2006 Yamaha 200 HP 4-Stroke Engine Problems

    Ywa, we did and it didnt have any effect. Thanks for the prompt reply/help

    Leave a comment:


  • 99yam40
    replied
    Re: 2006/2006 Yamaha 200 HP 4-Stroke Engine Problems

    did you try pumping the primer bulb when it died and would not restart?

    Leave a comment:

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