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  1. #1
    Join Date
    May 2010
    Location
    Boating on Raystown Lake, Pa
    Boat
    Sea Ray
    Details
    restored 1976 SRV200
    Engine(s)
    188 Mercruiser I/O
    Posts
    4,343

    Engine dies at idle

    I installed a rebuilt 2bbl carb on OldSkool and still have an idle issue. The engine acts like its running out of fuel but WOT will go to 5500rpm with no problem. As long as I can stay t 800rpm idle it will stay running but thats to high to take gear in.
    So do you think it can be the vacuum advance in the carb stuck? Timing is dead onI'm going to pull the plugs tonight to see if any are fouled out.

    Any suggestions are welcome.

    Bill

    Proud charter member of the HOLE IN THE WATER CLUB since 2012
    Anderson Forge and Metal Works: Quality on Edge.

  2. #2
    Join Date
    Mar 2011
    Location
    Australia
    Boat
    Sea Ray
    Details
    1996 330DA Sundancer; Layout A, Raymarine C80, DSM and RD218 radar
    Engine(s)
    Merc T-7.4L Carb Hurth 630 V-drives Kohler CZ23 6.5kw
    Posts
    163

    Engine dies at idle

    Sounds like the idle mixture screw setting is wrong or the idle bypass jet is blocked. At 800 the throttle plate is probably starting to open and the it's running on the main jet. I'm not sure what carby you have but I'd start looking at these things first.

    Also... Did you set the base ignition timing?

  3. #3
    Join Date
    May 2010
    Location
    Boating on Raystown Lake, Pa
    Boat
    Sea Ray
    Details
    restored 1976 SRV200
    Engine(s)
    188 Mercruiser I/O
    Posts
    4,343

    Re: Engine dies at idle

    Timing is in good shape. Is the idle bypass the small jet in the bottom of the float bowl? It's the only part I cold not gat out and I was afraid I would ruin it trying to get it out.

    Bill

    Proud charter member of the HOLE IN THE WATER CLUB since 2012
    Anderson Forge and Metal Works: Quality on Edge.

  4. #4
    Join Date
    Mar 2011
    Location
    Australia
    Boat
    Sea Ray
    Details
    1996 330DA Sundancer; Layout A, Raymarine C80, DSM and RD218 radar
    Engine(s)
    Merc T-7.4L Carb Hurth 630 V-drives Kohler CZ23 6.5kw
    Posts
    163

    Engine dies at idle

    Which carb do you have? Some use the main jets for idle and some have a separate circuit. Make sure that ignition timing is spot on to because it can cause a lot of idle problems and unnecessarily chasing carb settings.

  5. #5
    Join Date
    May 2010
    Location
    Boating on Raystown Lake, Pa
    Boat
    Sea Ray
    Details
    restored 1976 SRV200
    Engine(s)
    188 Mercruiser I/O
    Posts
    4,343

    Re: Engine dies at idle

    The timing is right on. There is no idle jet adjustment on this carb. It's a Rochester 2bbl. (GM). When I opened the carb up there was a lot of scaling on the bowl like water had gotten into it though the filter was in good condition. I cleaned it up and installed a carb kit. I blow ever orifice out as I went through it.

    Bill

    Proud charter member of the HOLE IN THE WATER CLUB since 2012
    Anderson Forge and Metal Works: Quality on Edge.

  6. #6
    Join Date
    Mar 2011
    Location
    Australia
    Boat
    Sea Ray
    Details
    1996 330DA Sundancer; Layout A, Raymarine C80, DSM and RD218 radar
    Engine(s)
    Merc T-7.4L Carb Hurth 630 V-drives Kohler CZ23 6.5kw
    Posts
    163

    Engine dies at idle

    I'd like to help more but I'm not familiar with those. Good luck, hopefully it's just adjustment (I think they have two idle mixture screws??)

  7. #7
    Join Date
    May 2010
    Location
    Boating on Raystown Lake, Pa
    Boat
    Sea Ray
    Details
    restored 1976 SRV200
    Engine(s)
    188 Mercruiser I/O
    Posts
    4,343

    Re: Engine dies at idle

    Thank test and yes there are 2. Before rebuild the screws did nothing even when screwed all the way in. Now they make a difference when screwed in. Adjusted them from bottom out 2 turns to get the engine started then fine tuned them after start. Still will only idle at 800 and dies out at 600rpm. Engine was running great then all of a sudden not so much.

    Bill

    Proud charter member of the HOLE IN THE WATER CLUB since 2012
    Anderson Forge and Metal Works: Quality on Edge.

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