Missing at slow speed

H

Hal380

New member
Just dropped my V20 in yesterday and while on a trial run noticed at low speed the engine sounds like it missing and there is some vibration. At higher speed it seems to even out. Any suggestions?

Things I already have done:
changed plugs
new fuel filter
fresh fuel with startron added
Fuel water separator installed.

I'm not much of a mechanic so I don't want to mess with this thing too much. May have to get a mechanic on the water to actually see what's happening.

Any help would be appreciated

Regards

Hal
 
Welcome to the board, Hal...and to V20 ownership!!...yer gonna have a big time...

There are lots of people here who want to help you out, but it will be helpful if you will post the type motor you have...is it inboard/outboard...outboard...2 stroke...4 stroke...what brand motor?...Evinrude, Yamaha, Mercury...the more you tell, the more we can help you out...

Pictures are ALWAYS helpful...
 
Thanks Reel

Boy do I have egg on my face - I have always said "A good answer starts with a good question" Here's the data

150EFI Mercury outboard -1990, rebuilt in 2004. Starts right up, idles well even at slow speed - a little rought, but doesn't stall. At slow speed it vibrates even to the point where you can feel it in the boat - not real harsh, but noticable.

Regards and Thanks

Hal
 
Get a mechanic to look at it before you use it hard. Its very easy to lean out a cylinder and blow the powerhead
 
Are you sure on the year? Not many EFI engines in 90 from MERCURY except for the high end performance engines. Start with the basics, check compression, spark, timing, and if it's an EFI engine you should probably send the injectors out to BROCATO or somebody for cleaning and flow testing as well as adjust the TPS.
 
More Egg on my face

I checked the year and it is a 2000. I solved the problem and things are running smoothly. I am embarrased as hell to admit it but the problem was that when I changed the plugs, 2 of the 6 plug connectiors were not fullly seated on the spark plug. I admit that I had to really push hard to get the 2 leads to snap into place, but once that was done the engine starts right up and idles smoothly.
 
Ok problem solved - and no wise cracks please.

Decided to pull a plug to see if there were any evidence of fouling. I then noticed that not all of the plug caps were as deeply seated on the plugs as others. As I pushed on all the plug caps - 2 "snapped" on further. I am not as mechanically inept as this makes me sound, but it is what happened. Now the moter purrs as low idle and is smooth at low speed. The only reason I am embarrashing myself like this is as a courtesy to those who replied and tried to help.

Regards and thanks

Hal
 
Hal380 said:
Ok problem solved - and no wise cracks please.

Decided to pull a plug to see if there were any evidence of fouling. I then noticed that not all of the plug caps were as deeply seated on the plugs as others. As I pushed on all the plug caps - 2 "snapped" on further. I am not as mechanically inept as this makes me sound, but it is what happened. Now the moter purrs as low idle and is smooth at low speed. The only reason I am embarrashing myself like this is as a courtesy to those who replied and tried to help.

Regards and thanks

Hal
Click to expand...

It's not a mistake, it's a learning experience. It ranks right up there with leaving the drain plug out of the boat and then launching it. Point being that you'll always remember to check the wires now when you change the plugs. You get an attaboy for this one for solving it.
 
Been there and done exactly that.....barely made it in one day....hooked it up at home and stood there going WTF..... click click and I was good to go....

Spareparts gave me the good fix to use some small black wire ties to cinch them down as mine would come loose periodically with just normal running.
 
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