http://forums.iboats.com/showthread.php?t=247365&highlight=mercruiser+flooding
I posted this thread a couple weeks ago, and still have not been able to figure it out. I am starting to think it is not flooding anymore. I think the wetness I amseeing in the carb is from it popping back out the carb at low RPM.
Symtoms: Only running on #1 and #4 cylinders.(Firing order 1,3,4,2) It will fire up pretty easy, but it will pop out the carb until I can get the RPM's up above 1100 or so then it runs smooth, no poping or backfiring unless I wack the throttle. I can pull #2 and #3 plug wires off with no change at all.
I thought it was flooding beacuse it made sense as to why #2 and #3 were not running (carb sets right over #2 and #3 intake ports) But I have checked the float and seat and it is sealing well. I can not blow into the carb through the fuel inlet. I did find a torn gasket which I thought could be pulling fuel from the bowl into the intake, but I rebuilt the carb and there was no change. When I put the carb back on (dry) It fired as soon as fuel got to the carb, and was only running on 2. Which is telling me it is not flooding. I have moved the plugs from the non firing cylinders to the firing cylinders and no change. Fired right up on 1&4. I have checked for spark and all 4 have spark. Checked compression and 1&4 had 115psi and #2&3 had 105psi. Which should be enough to run. I put the old cap on and there was no change. (I replaced cap wires plugs, points, fuel pump etc last year) I have tried adjusting the timing with the boat running to pick up the 2 down cylinders, I have cleaned and set the point gap.
Where I am now: I am going back to the ingnition system. Spark does seem kinda weak, Could a coil on the way out cause this? Possibly bad wires on #2 and #3? I am going to recheck compression with a different gauge and put a spark tester on to see if we have spark while it is running. Where else can I look?
Any help would be greatly appreciated.
I posted this thread a couple weeks ago, and still have not been able to figure it out. I am starting to think it is not flooding anymore. I think the wetness I amseeing in the carb is from it popping back out the carb at low RPM.
Symtoms: Only running on #1 and #4 cylinders.(Firing order 1,3,4,2) It will fire up pretty easy, but it will pop out the carb until I can get the RPM's up above 1100 or so then it runs smooth, no poping or backfiring unless I wack the throttle. I can pull #2 and #3 plug wires off with no change at all.
I thought it was flooding beacuse it made sense as to why #2 and #3 were not running (carb sets right over #2 and #3 intake ports) But I have checked the float and seat and it is sealing well. I can not blow into the carb through the fuel inlet. I did find a torn gasket which I thought could be pulling fuel from the bowl into the intake, but I rebuilt the carb and there was no change. When I put the carb back on (dry) It fired as soon as fuel got to the carb, and was only running on 2. Which is telling me it is not flooding. I have moved the plugs from the non firing cylinders to the firing cylinders and no change. Fired right up on 1&4. I have checked for spark and all 4 have spark. Checked compression and 1&4 had 115psi and #2&3 had 105psi. Which should be enough to run. I put the old cap on and there was no change. (I replaced cap wires plugs, points, fuel pump etc last year) I have tried adjusting the timing with the boat running to pick up the 2 down cylinders, I have cleaned and set the point gap.
Where I am now: I am going back to the ingnition system. Spark does seem kinda weak, Could a coil on the way out cause this? Possibly bad wires on #2 and #3? I am going to recheck compression with a different gauge and put a spark tester on to see if we have spark while it is running. Where else can I look?
Any help would be greatly appreciated.
