Hello people. This winter we bought a Sea Ray Seville 180 with a MerCruiser MCM 4.3LX in it.
The engine starts almost immediately and runs nicely. However, after boating for a while the engine starts to hold back, first at full throttle but later also at half throttle, when you then accelerate it starts to backfire. I have a video of this:
I don't know if this is time or temperature dependent.
We initially thought there was a lack of fuel so we checked the following things:
- All ignition parts are properly tightened
- Replace the distribution cover
- Tank venting
- Replace the fuel filter
- Cleaned the carb: Here I discovered that the second pair of gas valves are stuck. I freed them up so that they function again. I thought this might be the problem, but it doesn't matter.
I'm going to check the following things:
- Check whether the fuel pump continues to run. You can hear this running when starting, but I have not yet checked whether it continues to run when the engine is running.
- Check all spark plugs to see if any have a different color.
- Manually switch on the fuel pump and check for fuel leaks.
Are there any other things we can look at?
The next thing would be to replace the carb, but these are quite expensive so I prefer to do this last.
Thank you in advance!
Kind regards,
Sander
The engine starts almost immediately and runs nicely. However, after boating for a while the engine starts to hold back, first at full throttle but later also at half throttle, when you then accelerate it starts to backfire. I have a video of this:
I don't know if this is time or temperature dependent.
We initially thought there was a lack of fuel so we checked the following things:
- All ignition parts are properly tightened
- Replace the distribution cover
- Tank venting
- Replace the fuel filter
- Cleaned the carb: Here I discovered that the second pair of gas valves are stuck. I freed them up so that they function again. I thought this might be the problem, but it doesn't matter.
I'm going to check the following things:
- Check whether the fuel pump continues to run. You can hear this running when starting, but I have not yet checked whether it continues to run when the engine is running.
- Check all spark plugs to see if any have a different color.
- Manually switch on the fuel pump and check for fuel leaks.
Are there any other things we can look at?
The next thing would be to replace the carb, but these are quite expensive so I prefer to do this last.
Thank you in advance!
Kind regards,
Sander
