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  1. #1

    Default 2015 Moomba mondo surf edition \4238 engine fault code question

    Each time we go out and fill the ballast up and begin to surf the check engine light goes on. Per a thread I read on here I replaced both O2 sensors. I am now trying to burn through the remaining gas in the tank running laps around our lake, just in case it is a gas issue. No check engine light when I am running 30 mph to burn gas. I am now going to fill the tank with 91 non-ethanol gas. Again, the orange check engine only comes on when the motor is under high stress, surfing for example. Any other thoughts on what it could be? I do not have the correct tools or knowledge to check the fuel line pressure.
    2015 Moomba Mondo Surf Edition 6.2 L raptor with upgraded ballast (910s in back and 500 in front)

  2. #2
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
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    587

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    Quote Originally Posted by Wdavid View Post
    Each time we go out and fill the ballast up and begin to surf the check engine light goes on. Per a thread I read on here I replaced both O2 sensors. I am now trying to burn through the remaining gas in the tank running laps around our lake, just in case it is a gas issue. No check engine light when I am running 30 mph to burn gas. I am now going to fill the tank with 91 non-ethanol gas. Again, the orange check engine only comes on when the motor is under high stress, surfing for example. Any other thoughts on what it could be? I do not have the correct tools or knowledge to check the fuel line pressure.
    Go around and check all exhaust connections. If you changed the O2 sensor and still getting the code, you have a leak allowing fresh air in. Tighten all the V-band clamps.
    2015 Moomba Mojo Surf Edition
    4,000lbs
    Manual Flow

  3. #3

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    [QUOTE=Holdmybeer;371452]Go around and check all exhaust connections. If you changed the O2 sensor and still getting the code, you have a leak allowing fresh air in. Tighten all the V-band clamps.[/QUOTE

    I hate to ask the obvious, but can you specifically point out to me what clamps...as I look at the engine there seem to be a lot! Sorry. My engine experience is limited!
    2015 Moomba Mondo Surf Edition 6.2 L raptor with upgraded ballast (910s in back and 500 in front)

  4. #4
    Join Date
    Jun 2020
    Location
    Reno, NV
    Posts
    551

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    Is it possible itís a collapsed CAT matrix? If I remember there were issues with Indmar CATs during those years in which the matrix would collapse giving O2 sensor faults and a number of other misc codes.

    If you can visualize the honeycomb, see if itís intact.


    Currently boatless
    2020 SA 450 Wife calls it White Cloud. Said it makes her feel "Classy"
    2017 Sanger V215sx. We call it Viagra because it's the little blue pill that gets everyone up (Sold)

  5. #5

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    Quote Originally Posted by Holdmybeer View Post
    Go around and check all exhaust connections. If you changed the O2 sensor and still getting the code, you have a leak allowing fresh air in. Tighten all the V-band clamps.

    I hate to ask the obvious, but can you specifically point out to me what clamps...as I look at the engine there seem to be a lot! Sorry. My engine experience is limited!
    2015 Moomba Mondo Surf Edition 6.2 L raptor with upgraded ballast (910s in back and 500 in front)

  6. #6

    Default

    I hate to ask the obvious, but can you specifically point out to me what clamps...as I look at the engine there seem to be a lot! Sorry. My engine experience is limited!
    2015 Moomba Mondo Surf Edition 6.2 L raptor with upgraded ballast (910s in back and 500 in front)

  7. #7
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
    Posts
    587

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    Quote Originally Posted by Wdavid View Post
    I hate to ask the obvious, but can you specifically point out to me what clamps...as I look at the engine there seem to be a lot! Sorry. My engine experience is limited!
    Check these connections.
    Back of the engine can access through rear lockers/v-drive doghouse. CATS are the canisters on the exhaust.

    raptor-400-full-engine.jpg
    2015 Moomba Mojo Surf Edition
    4,000lbs
    Manual Flow

  8. #8

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    Awesome! Thank you.
    2015 Moomba Mondo Surf Edition 6.2 L raptor with upgraded ballast (910s in back and 500 in front)

  9. #9
    Join Date
    Aug 2011
    Posts
    2,497

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    Quote Originally Posted by Wdavid View Post
    Awesome! Thank you.

    Just making sure you checked ALL the o2 sensors, there's 4, 2 before and 2 after.

    Usually it's the after 02s that go bad and I got easily got confused and change the wrong one.

    Sorry the ones on the exhaust manifold.
    Last edited by parrothd; 07-22-2021 at 01:40 PM.
    http://www.instgram.com/jlyons30
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV - Sold
    2017 Moomba Craz - Enzos, Lead

  10. #10
    Join Date
    Aug 2011
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    Quote Originally Posted by parrothd View Post
    Just making sure you check ALL the o2 sensors, there's 4, 2 before and 2 after.

    Usually it's the after 02s that go bad and I got easily got confused and change the wrong one.
    Also if the light comes on when you fill the ballast it means the wall is collapsing into the engine and pressing on the O2 sensor wire.
    http://www.instgram.com/jlyons30
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV - Sold
    2017 Moomba Craz - Enzos, Lead

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