I have a mercruiser 3.0 (2000) with a mercarb 2 barrel on it. Now the problem that I am having with it to me is a brain number. With the choke closed I can start the motor and have it idle at around 700 Rpm's and then slowly increase to 1000 RPMS as the motor warms up and the choke opens. Once the choke opens to a certain point ( I would say about 3/4 of the way open) the engine dies. So i would appear that there is an air leak and the engine is getting too much air. NOw in order to restart the motor I have to place the throttle at 3/4 throttle and when the engine starts I have to continually rev the engine to keep it running. After revving the engine it sometimes will allow me to let it "idle" at 2800 rpm. If it does this then I can return the throttle back to neutral and have the engine idle at 700 RPM's. I do not understand how one minute it acts fine (initial startup) then acts like it has an air leak and then returns to a normal idle????
I have tested all over the place for an air leak and have found none. The carb was rebuilt last year by the dealer, and was working fine. I have replaced the fuel pump and have tried running from an alternate fuel source. I am fresh out of ideas and fully frustrated.
I have tested all over the place for an air leak and have found none. The carb was rebuilt last year by the dealer, and was working fine. I have replaced the fuel pump and have tried running from an alternate fuel source. I am fresh out of ideas and fully frustrated.
