Kills at midrange throttle settings

[Lester B.]

Help! 1994 4.3L 200(205?) HP mercruiser starts great, idles fine, runs 3 - 3.5 K just fine, but acts like it runs out of gas when run at 1800 - 2000 RPM for more than a few minutes. Restarts OK and then were back to square one, cruise and idle, works good, midrange throttle, kills after 3 - 10 minutes. Running 50/50 last years gas and new gas, 91 octane, no ethenol. Marine Seafoam used. Any Ideas where we should start looking would be appreciated!

 

[alldodge]

1994 holley carb, right???
Most likely the power valve in the carb.

 

[Lester B.]

Thanks, I'll check that out. Any thoughts on it being the coil?

 

[dubs283]

Any thoughts on it being the coil?

the coil is usually the LAST ignition component to fail. that said i have found faulty coils but that is after most other components have been tested/replaced

like ad said, check your carb/fuel system first, then you can focus on the ignition system

 

[Lou C]

A '94 I'd think is the Weber 4bbl which is similar to the Edelbrock 1409. Merc used Quadrajets till about '89/90 then switched to the 4bbl Weber.

 

[alldodge]

1994 holley carb, right???
Most likely the power valve in the carb.

I messed up, had been looking at a VP issue and thought I was on the same thread

We don't know if you have a 2 or 4bbl carb. If 4bbl then it should be a weber as Lou mentioned. If its a 2bbl then its a Merc (like the rochester 2GC)

In any case the issue is most likely in the carb

 

[Lester B.]

Its a four barrel. The mechanic working on it is fixated on the coil, which is frustrating.

 

[Lester B.]

Finally convinced him to look at the carb, the float was sticky. hopfully, a new one cures it. Thanks folks!

 

[Lester B.]

BTW, it is a Rochester Quadrajet carb.