Mercruser 350 Chevy

[nek]

My Merc Cruser 350 chevy is missing and starts to lose power as the engine heats up it will idle all day but the hotter it gets the worse the missing and power loss is. I replaced spark plugs, plug wires, coil, distributor cap, and ignition, carb has been rebuilt, what is next?

 

[Don S]

Re: Mercruser 350 Chevy

Time for a compression test.
Follow all the procedures in this service bulletin.

http://www.boatfix.com/merc/Bullet/97/97_25.pdf

 

[nek]

Re: Mercruser 350 Chevy

I did a compression test on all 8 cylinders all 8 were around 150 is it posible I have a fuel pickup problem?

 

[mkast]

Re: Mercruser 350 Chevy

My Merc Cruser 350 chevy is missing and starts to lose power as the engine heats up it will idle all day but the hotter it gets the worse the missing and power loss is. carb has been rebuilt, what is next?

Why was the carburetor remounted? Sounds like the choke isn't opening.

 

[urnmygto]

Re: Mercruser 350 Chevy

Good point, Also have you checked your fuel pump? But it sounds like the hotter it gets starts running bad, I would say choke. or gasket on the bottom of carb could be sucking air once it's warmed up

 

[nek]

Re: Mercruser 350 Chevy

The Carb is a new remanufactured Rodchester I just installed it this week. I was told to replace the carb so I did but same problem.

 

[nek]

Re: Mercruser 350 Chevy

yes I am reading the replies

 

[maxxman04]

Re: Mercruser 350 Chevy

the simple diagnosis sounds like a choke not opening when it should, or not opening as far as it should. when cold, choke plate should be closed, as motor warms up, the plate should open, between 3/4-full, meaning you should be able to look right down into carb. opening just a little bit or less than halfway minimum is not good.