No power and engine is missing

[Daveegt]

All off a sudden my Wake 155 started missing and running ruff. Tying to start it, the battery acts as if low voltage, bairly turns over. Checking it shows 12.7 volts, but hardly turns over. When it start it runs ruff and shakes, has a had time getting up to 35 mph. Can a weak battery mess up the computer and cause it to miss fire the plugs and or the injectors?
Thanks for any help, Dave

 

[mikidymac]

Have it load tested.

Also a good idea on these when any running issues is to replace the spark plugs. The 4-Tec motors eat spark plugs and should be changed every season in my opinion.

 

[mkov608]

Strange ... I've never had to replace spark plugs during the season. My old 2-stroke XP went through plugs. I had to replace them nearly every time I went out.

 

[Daveegt]

Strange ... I've never had to replace spark plugs during the season. My old 2-stroke XP went through plugs. I had to replace them nearly every time I went out.[/QUOTE

I think these plugs must be 3 or 4 seasons old. I bought new ones today and will put them in tomorrow to see if ir helps.
Thanks to all that have contributed. I'll keep you informed.
Dave

 

[mikidymac]

Strange ... I've never had to replace spark plugs during the season. My old 2-stroke XP went through plugs. I had to replace them nearly every time I went out.

You are correct as my 2-stroke skis don't use plugs but for some reason these 4-tec ones love new plugs. It should be your first thing to change when there is an issue.

 

[Daveegt]

I can't believe that the 4-tec engine would need plugs very often, it should be close to a fuel injectioned electronic ignition engine of today. BUT, I replaced them and it seem it fixed it, haven't had it on the lake yet but started and revved up without any missing then idled back ok.
I can't believe this either.
Thanks for the input, it saved me a couple of headaches
Dave

 

[mikidymac]

I can't explain it either but it is very well documented here.

 

[GregM64]

Should be showing an error code with the miss.

 

[mikidymac]

Not always on the erron code.