Lakefisher420
Cadet
- Joined
- Jun 21, 2004
- Messages
- 26
I will start with alittle history of my problem. Fisrt thing is I have a 1994 mercruiser 3.0l with the EST ingnition. This problem started at the tail end of the season last year. The engine starts fine and seems to idle good It idles in the water at about 750rpms. This is what is going on we would get it on the water would run great for about a 30min to ahour and then started to cut out not bogg down at around 3000rpm's. so I talked to a service shop in town and told me to start my changing all the filter in the carb and add a water seperator that worked for one outing then started to repeat problem. So next I replaced the coil and thermo and started to use higher octane fuel that worked for on outing. Then the season was over. <br /><br />So this year after unwraping boat took it out to the same problem. So this time I checked my dis cap and all the contacts on the inside of the cap were rusty and corroded(sp) and the rotor was in the same shape so I replaced . The ignition module doesnt look in the best of shape but all the connectors and plugs are clean. So ran the boat after I replace those parts and still had a problem but not quite the same. This time it is not cutting out now it is like a fuel problem once it hits the higher rpms now it is bogging if I let off on the throttle it will not stall if I let it sit abit it will run for 15 minutes them it starts all over again. Now one other thing is that if I anchor and let the boat sit of a while it is hard to start but if I kind starting it like every 1/2hr or so starts no problem it is running at about 145-160temp. I was told that is right running temp for this engine. <br /><br />I was looking at the carb and I noticed on the auto choke it has these setting and my book says it should be 2 marks to the right of the center mark mine was set 4 marks to the right so I reset it back to were the book said still no different.<br /><br />I seem to think either I am getting vapor lock if so how do I fix that.<br />I also think the carb needs to be rebuild what do you guys think? wouldn't hurt would it<br />Maybe fuel pump? the sight line is clear no fuel in it.<br />A friend of mine told me a buddy of his had this some problem and changed eventhing just to find out it was the fuel sending unit on the tank I have never checked that. I have checked the fuel vent it is clean and still runs the same with the fuel cap off. Checked my plugs and they look fine they have light tan deposits on the tips and electrodes. Oil smells fine no gas smell.<br />Anyone have any Idea's please pass them on. I am having a huge party at my house on the 16th and I want to be able to take all the kids out in the boat.
