Welcome Guest - Sign Up today
Welcome Guest - Sign Up today

Announcement

Collapse
No announcement yet.

OMC 2.3 Cobra won't start

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • OMC 2.3 Cobra won't start

    Hi all

    I recently bought a bowrider with a 1988 Cobra OMC 2.3 fitted and it was running fine having been recently serviced.
    Problem is now i can't get it to start.
    It turns over and tries to start and if i crank the throttle it starts for a few secs and then just dies.
    Anyone any ideas as its doing my head in.
    I don;t have much boat engine experience but a bit of car engine knowledge but i'm stumped.

    Thanks

  • #2
    welcome aboard.

    first, how are you starting it.... what steps are you going thru exactly.

    list them.
    Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

    Comment


    • #3
      Hi. Thanks. Starting to wonder if i made a mistake
      With regards to starting, full tank of fresh fuel, fresh charged battery, muffs on the cooling fins, engine recently serviced and it will turn over fine and start for 3 or 4 secs before a fuel starve and then just keep turning until the battery dies. I have to keep the key in the start position though for the 3 or 4 secs it runs. i leave it go, it dies straight away

      Comment


      • #4
        Those carbed engines can be finicky on a cold start. Pump the throttle 3-4 times & see what it does. It sounds like you're either flooding it or not giving it enough gas. You have to find the sweet spot, so to speak. Also, I would pull the plugs & see if they're wet with gas. If so, it's flooded. You need to dry the plugs because that engine will never start if the plugs are wet.

        Comment


        • #5
          Right so i took off the lift pump.out it back together and it started,ran for 10 secs and died.wont start again now.sounds like flooding.how do i fix this?

          Comment


          • #6
            Took the plugs out, very sooty for new plugs,cleaned them up and it ran again for a few secs and died.gettin fuel to the carb cos it sprayed across the boat when i disconnected it and cranked it.is there a way to turn down the fuel mix or does the carb need to come out

            Comment


            • #7
              If it's flooding out could be time for a carb rebuild. Could be the float is stuck. Try tapping on the front of the carb where the fuel line is. That may break it loose but it's only a temporary fix at best. Btw, is the choke plate open or closed?

              Comment


              • #8
                The plate at the top is it? The flap is closed on start and opens with the throttle.heres the thing though the olugs were dry when i took them out.should they be wet if flooded?is it a carb off to check the float?

                Comment


                • #9
                  Originally posted by lisieux14 View Post
                  The plate at the top is it? The flap is closed on start and opens with the throttle.heres the thing though the olugs were dry when i took them out.should they be wet if flooded?is it a carb off to check the float?
                  Black soot on the plugs means it's running rich. Has the carb ever been rebuilt? What service was done on it?

                  Comment


                  • #10
                    Oils,water pump,filters and plugs. Carb doesnt look like it was touched in a while
                    Last edited by lisieux14; August 13th, 2019, 05:03 PM.

                    Comment


                    • #11
                      You might have a sticking float or bad needle valve that is not shutting off fuel flow as it should when the fuel bowl is full (just like a toilet valve!) The choke valve (top flap) needs to close on a cold engine, but as soon as it starts, it should pull open a fraction of an inch to give the engine enough air to keep running.

                      Cold starting....
                      Pull out throttle control to disengage shift system....pump throttle fully open 2x to allow choke to close and accel pump to squit fuel in to venturi...then set throttle control about 1/3 advanced...then crank it till it starts...it NEEDS the throttle to be open to have the fast idle needed to keep running. If you are not doing this it will never keep running with a cold engine.
                      1988 Four Winns 200 Horizon
                      4.3 OMC Cobra

                      98 Jeep Grand Cherokee 4.0 Selectrac
                      07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

                      "While air doesn't freeze....rust never sleeps"

                      Comment


                      • #12
                        Thanks for that lou.i have an old morse throttle lever and cant seem to run on just throttle out of gear.cant find a button or lever to disengage the gears

                        Comment


                        • #13
                          Check the ESA bracket and make sure that the roller tip is sitting in the middle of the "V" notch. If the ESA is triggered, it will run like crap and seem very rich.

                          Also, you said that it will stay running when you have the key turned then stop when you let go? If that is the case, these are set up to provide direct 12v to the ignition when starting, then when you let go of that key the 12v turns off and a lower voltage is sent to the coil through a separate wire. You might have a problem with this wire.

                          Also check the carb for dripping gas after it has just stalled. If it's dripping. you have to adjust the carb float/needle height, or may need to replace.

                          1988 Rinker Captiva 206 OMC 5.0 | 2005 Parker 2520SL Yam 4S 225
                          1997 Wellcraft Excel 23WA Ocean Pro 200 (Sold) | 1988 Bayliner Capri 1950 OMC 3.0 (Sold)

                          Comment


                          • #14
                            https://www.nlamarine.com/products/m...=7433668460574

                            this is the throttle lever i have. how do i run throttle only out of gear or can i?

                            Comment


                            • #15
                              Sign up today
                              you pull the handle out toward you like Lou told you to do. grab the base and pull outward about 1/4". that is how OMC sourced controls work
                              Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

                              1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

                              Past Boats
                              1970 Wooster Hellion - Merc 9.8
                              2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
                              1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

                              What’s behind you doesn’t matter.Enzo Ferrari

                              Comment

                              Working...
                              X