Missing at slow speed

[Hal380]

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

[draglink]

Get a mechanic to look at it before you use it hard. Its very easy to lean out a cylinder and blow the powerhead

[phatdaddy]

http://www.harborfreight.com/90-inli...ker-69023.html

i'd pick up one of these at harbor freight or o'reilys, pepboys etc. check fire at idle.

[THEFERMANATOR]

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.

[Hal380]

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.