Mercruiser problem

roosterin2000

Recruit
Joined
Aug 19, 2001
Messages
2
Engine misses above idle speed, mercruiser 140hp i/o rochester carb. just bought boat been in storage 4 years 1974 model 50 hours run time where do I start? :confused:
 

Walter

Senior Chief Petty Officer
Joined
Jul 3, 2001
Messages
787
Re: Mercruiser problem

Wow...50 hours on a 27 year old boat? I'd say the problem is she isn't broken in yet!<br /><br />Let's begin with the basics. How old is the fuel? Fuel filters? That's where I'd start... <br /><br />Give us a bit more background...and tell us what you've done thus far...maybe we can help more knowing what been done.<br /><br />Walt
 

roosterin2000

Recruit
Joined
Aug 19, 2001
Messages
2
Re: Mercruiser problem

Replaced gas tank, cleaned fuel filters, set timing, tried boat when idles its fine try to speed it up it starts to miss misses worse when pulling skier
 

fone_man

Senior Chief Petty Officer
Joined
Jul 8, 2001
Messages
701
Re: Mercruiser problem

Have you check condition of points, plugs, wires, etc...<br /><br />Let us know???<br /><br /> :confused:
 

Walter

Senior Chief Petty Officer
Joined
Jul 3, 2001
Messages
787
Re: Mercruiser problem

Did you do the repairs you describe (replace fuel tank, clean filters etc) as an attempt to rectify the engine miss or did the engine begin to miss after you'd done these things? I'm trying to determine if you may have inadvertantly contributed to the problem... Say your new fuel tank's supply line, pick up tube, or vent isn't functioning correctly...something along those lines.<br /><br />Like Fone_Man says...it's wise to check your ignition components too! Who knows what kind of critters may be roosting in your distributor cap! Years of non use can deteriorate electrical components as well as if they had mega hours logged against them, so you outta just go for broke (literally) and consider buying some new ignition parts...Nowadays you can get them at Napa or most other auto parts stores. You need not spend the extra money most marine dealerships charge. Be sure to have your engine's year, model, and serial number handy when you go to purchase parts...<br /><br />Keep us posted of your progress! Good luck!<br /><br />Walt
 
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