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  1. #1
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    Question 03 150 Yamaha surges after throttle is givin??

    I`ve got a 2003 150 Yamaha fuel injected that idles great starts great and will take off good but then starts surging. whats been done so far found water in the fuel,cleaned tank replaced all filters in boat and on motor,two new manual fuel pumps, new filterand rebuild on the electric pump on the vst, new plugs,also new filters on the injectors. its firing on all six at idle and at wot. but suges from 5000 rpm to 2800 to 3000 to 5000 and so on thinking stator maybe ?? any info would be Great Thanks
    "Get in Sit Down Shut Up And Hold on" OOOAH "

  2. #2
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    Have you checked fuel system with a vacuum gauge,fuel pressure at the vst.and get a voltage reading from o2 sensor.maybe you could explain better by what you meant about rebuilding electric fuel pump in vst?
    21 SuperBoat VF200 Yamaha SHO
    Bender Clan memberEroshibend Yamamoto
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  3. #3
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    Quote Originally Posted by Superbender View Post
    Have you checked fuel system with a vacuum gauge,fuel pressure at the vst.and get a voltage reading from o2 sensor.maybe you could explain better by what you meant about rebuilding electric fuel pump in vst?
    yeah Bender I have checked the fuel pressure and the vacuum it all is with in the guide lines.i didn`t know that a two stroke had a o2 sensor. and what I meant about rebuilding the vst was the float and needle in the vapor tank and a new filter on the electric motor sorry I should have explained that better . I was also wondering about the throttle position sensor??
    "Get in Sit Down Shut Up And Hold on" OOOAH "

  4. #4
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    Any ideas ?? Need Help.
    "Get in Sit Down Shut Up And Hold on" OOOAH "

  5. #5
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    Can you check fuel pressure when the surge happens?
    Markus' Performance Boating Links:
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  6. #6
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    Yes I put a gauge on it and it was pretty much steady pressure. It fluctuated slightly.
    "Get in Sit Down Shut Up And Hold on" OOOAH "

  7. #7
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    Yes it has an O2 sensor. If it is fouled it will cause it to surge, it also has a joint tube that joins the sensor to the #1 cylinder. If it is plugged it will cause the same issue.
    Last edited by VectorPat; 04-04-2013 at 09:32 PM.
    Fellow G-Man of the Sunshine Syndicate-Dixie Wrecked Chaptor..
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    94 17MA Maverick 115 Yamaha
    2006 Mustang GT, with a belt driven air cleaner

  8. #8
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    Alright thanks I'll check that out and let ya know..
    "Get in Sit Down Shut Up And Hold on" OOOAH "

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    OK just to make sure here you have more then 4lbs going into vst,vst has at least 30 to 35lbs of fuel pressure when problem occurs,and you have 3 or less pounds of vacuum.next I'm gonna ask you to get a friend to drive the boat while you mist a little premix into motor while surging occurs thru the airbox.
    21 SuperBoat VF200 Yamaha SHO
    Bender Clan memberEroshibend Yamamoto
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  10. #10
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    ok Fellas I`ve tried all the above plus replacing the fuel pump and pressure regulator in the vst. looks like I have a breakdown in the ignition at around 2800 to 3500 rpm stator...Brain...trigger??? I`m at a loss the new pump and all did give it a pick up but now its more noticeable that it is an ignition Break down any Thoughts Please.. Thanks
    "Get in Sit Down Shut Up And Hold on" OOOAH "

  11. #11
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    Check each cyl with a timing light and try to isolate which cylinder it is and make sure it truly is an ignition problem.
    Fellow G-Man of the Sunshine Syndicate-Dixie Wrecked Chaptor..
    We Put The F. U. in FUN
    94 17MA Maverick 115 Yamaha
    2006 Mustang GT, with a belt driven air cleaner

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    Alright it looks like 5&6 are miss firing only at upper rpm idling they fire just fine...any suggestion??
    "Get in Sit Down Shut Up And Hold on" OOOAH "

  13. #13
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    Ok I double checked the miss fires it seems like its random on all six so I'm leaning a stator or the I'm going to ohm test them tomorrow does anyone have a chart of what the should be I've been trying to find that all night the motor its a sx150 Txrb 2003 150 any info would be Thanks
    "Get in Sit Down Shut Up And Hold on" OOOAH "

  14. #14
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    AlLright I've Done All The Electrical Checks.. Looks Like The Throttle Position Sensor IsTheOnly Thing That The Numbers Don't Match.. Volts Ohms..WouldThatCause This Kind Of Behavior??
    "Get in Sit Down Shut Up And Hold on" OOOAH "

  15. #15
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    Explain how you are testing it. You can check them by using an old analog style meter. The needle should move smoothly along with the sweep of the TPS. If there is a dead spot you will see the needle jerk or bounce around. This is sometimes hard to see on a digital meter. You should have 5v going into it on the black and orange wire and .5v on the black and pink wires with the throttle plates completely shut. With the plates adjusted for the correct idle speed it will have somewhere around .6v on the black and pink. I dont know what the resistance should be, I only use voltage to check them.
    Fellow G-Man of the Sunshine Syndicate-Dixie Wrecked Chaptor..
    We Put The F. U. in FUN
    94 17MA Maverick 115 Yamaha
    2006 Mustang GT, with a belt driven air cleaner

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