need a little input

1agofst1agofst Posts: 16Member
i have 3.0 merc i/o
there is black smoke coming out of my exhaust and a black crud
we had it out for the first time this year and everything was fine and then the second trip was a no go,it was idling rough and blowing black stuff out of the exhaust,i cleaned the carb since the butterfly was not opening,it is now opening but still have rough idle and black smoke
could it just be bad gas or is it a carb problem
thanks
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Comments

  • mvnmvn Uxbridge, OntarioPosts: 459Member, Moderator ✭✭✭✭

    I had this issue with a Holly 4-bbl carb once.  Had it rebuilt and everything was fine after that. 

     

    Check the flame arrestor for cleanliness, check any vacuum lines for cracks, replace the fuel filter/water separator, make sure your gas is fresh........the obvious stuff first.  Someone else will probably have more/better advice.

     

    Mark

    Good,  fast,  cheap.... pick two. 
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  • BabyboomerBabyboomer Louisville KyPosts: 915Member, Moderator ✭✭✭✭
    What drive do you have Alpha or Bravo I've seen Bravo 3 when the impeller goes out blow some smoke and burnt rubber. Was it running hot? 

    Slip 866 Sunset Marina Byrdstown Tn
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  • mvnmvn Uxbridge, OntarioPosts: 459Member, Moderator ✭✭✭✭
    edited June 2013

    OP has a 3.0L Merc.....Alpha One.  Good point though Boomer....what was the temp?

    Mark

    Post edited by mvn on
    Good,  fast,  cheap.... pick two. 
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  • BabyboomerBabyboomer Louisville KyPosts: 915Member, Moderator ✭✭✭✭
    What I thought on Alpha so I don't have a clue :(|)

    Slip 866 Sunset Marina Byrdstown Tn
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  • 1agofst1agofst Posts: 16Member
    temp is fine
    once i hold the carb open with a screwdriver it purs like a kitten,but when i take the scredriver out, the butterfly closes and it starts smokin and idling rough,i spprayed it with carb cleaner and it opens now,but it's still smokin and idling a little rough,i just wanted to check here before i take it to the shop and have to spend any money
    i have a puddle of black water in my driveway from the exhaust,it looks like carbon
    oh btw it's on a 94 rinker 180 lol,i forgot to put that in the post originally



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  • bat32bat32 Posts: 161Member ✭✭✭
    Is the choke working?

     

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  • 212rowboat212rowboat Posts: 1,268Member ✭✭✭✭
    Take your positive crankcase ventilation valve out and shake it.. if it rattles, it's most likely okay.. if it doesn't, it's likely stuck... If it's stuck open, you've got a nice drinking straw for your intake to sip oil right out of the valve covers.. if its stuck closed, you could have too much pressure creating and/or facilitating blow by of gasses past the piston rings... Neither is any good.. it's like a ten dollar part that can be a monster if left unchecked.

    Oil burns bluish to blackish.. super fuel rich does too, but more brackish than oil..

    Pull a spark plug.. snap a pic of the business end.. post it.. let's get a look at what's happening in that thing!!
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  • AlswaggAlswagg Posts: 378Member ✭✭✭
    The choke is not opening properly,  Have this check and repared. asap.  Don't run util it is fixed.  You did not say what year you have, but you either have a hot air choke or an electric.  Al
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  • mvnmvn Uxbridge, OntarioPosts: 459Member, Moderator ✭✭✭✭
    Choke?   I totally forgot about that one!  See what happens when you stop playing with carbs??!? 

    Mark
    Good,  fast,  cheap.... pick two. 
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  • 1agofst1agofst Posts: 16Member
    well fellas it seems that one of the needles in my carb was bad,the rubber tip on the end was half missing
    so we did a carb rebuild and hit the water,she ran great for a while and when i came out of the dreaded no wake zone,i nailed it and it bogged out and shut off,luckily it started back up,i had to feather the throttle to get it goin full throttle again,so who knows,but i did notice my voltage guage was reading 18 and the battery was hot as could be,got it home and checked the water level in the batt and it was low,so hopefully that is the culprit as of now lol,i will find out this weekend haha
    enjoy the water my friends
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  • mvnmvn Uxbridge, OntarioPosts: 459Member, Moderator ✭✭✭✭

    Yikes.....18 volts??!?  Can you take a voltage reading with a handheld volt meter?  The helm gauges aren't the most accurate.  If you still see that high of a voltage, I would suspect your voltage regulator/alternator.  That would explain your hot battery.

    Mark

    Good,  fast,  cheap.... pick two. 
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  • 1agofst1agofst Posts: 16Member
    im gonna check it with a volt meter when i get home,i hope i didnt toast the battery cause its only a year old
    i"ll let ya know the out come,thanks for the input mvn
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  • 1agofst1agofst Posts: 16Member
    mvn,i like your avatar,bob denvers wife is a good friend of mine

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  • 212rowboat212rowboat Posts: 1,268Member ✭✭✭✭
    Ethanol is hades on carbs.. all you can do is treat it or find rec fuel. It'll eat rubber quick like.
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  • raybo3raybo3 Revere MAPosts: 1,354Moderator ✭✭✭✭
    If you have been pumping 18 volts you should be happy if its only a battery that is bad. You really need to find out if you have a voltage problem before you have more MAJOR problems....
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  • 1agofst1agofst Posts: 16Member
    checked it with a volt meter,it was reading 14.42,good thing,guage must be bad,carb has been rebuilt,but boat shop didnt  check electric choke when they rebuilt the carb,according to the mechanic,the choke aint closing,so  i'm just waiting on him to fix it,so we can get back on the water

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