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  1. #1
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    97 Mariner 200HP MAG EFI boggs down on acceleration

    I picked up a 1997 Mariner 200 HP Magnum EFI last spring. It ran when I bought it. I went to the trouble of reinstalling the oil injection system to make the motor as original. Now, not getting into the reason why I would do that, I have not yet diagnosed why the motor bogs down upon acceleration. I checked everything I can think of. New switch boxes, new stator (looked like it got too hot), flywheel looks OK, new trigger. Checked the fuel lines. Checked the fuel (fresh premium gas in the tank),fuel pressure good at the schrader valve. Even the local marine mechanic is having trouble isolating the problem. I keep thinking it's an electrical problem. Anybody out there have any ideas where to look next? It's time to get out fishing! I should also add that I sent the fuel injectors out and had them tested and cleaned. Made no difference.
    Last edited by Sunny Jim; 10-10-2017 at 05:08 PM. Reason: Additional information

  2. #2
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    Try a known good fuel line and primer ball run from a 5 gal remote fuel tank.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  3. #3
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    Quote Originally Posted by Dave Strong View Post
    Try a known good fuel line and primer ball run from a 5 gal remote fuel tank.

    Dave
    I can only say that I replaced the entire fuel line even though there was no obstruction in the old one. The primer ball seems to operate properly. I have not yet tried separate fuel. I'll give it a try. Thanks for the input.

  4. #4
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    Make sure the timing advance is moving freely, I had one that was sticky, don't the same thing

  5. #5
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    Did you check the throttle position sensor? http://www.screamandfly.com/showthre...-EFI-TPS-issue

  6. #6
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    Quote Originally Posted by pappa pete View Post
    Make sure the timing advance is moving freely, I had one that was sticky, don't the same thing
    I'll check that. It's quite possible, losing power right out of idle. Thanks.

  7. #7
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    I did check that early on. Had the test harness and it read good.

  8. #8
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    Have you checked the regulators had mine shorting out to its own housing sending voltage to the block it would bog down would not get on plan
    🇺🇸IF YOUR NOT LIVING ON THE EDGE YOUR TAKING UP SPACE.🇺🇸 Travis 1967 15t powercat

  9. #9
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    '97 Mariner bogging down

    Quote Originally Posted by 67kitten View Post
    Have you checked the regulators had mine shorting out to its own housing sending voltage to the block it would bog down would not get on plan
    We may have isolated the problem. I hope to find out this week when it gets put back together. I'll let you know! OK. Here is what we found after a very thorough search of the electrical system without finding anything wrong . While going through the fuel system route inside the VST canister, there is a very small filter screen incorporated into the fuel pressure regulator. This screen was covered with some kind of deposit that cut off most of the fuel flow to the fuel rail. After cleaning this screen the motor ran good. Tough to find this screen, if you don't know it's there. Hope this helps someone else. Thanks for all of your input, Scream and Fly guys!
    Last edited by Sunny Jim; 10-17-2017 at 06:06 PM. Reason: New information

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