FICHT Surging at idle

[metairiedave]

2000 Rude 200 hp E200FCXSSC surging at idle from 576 to 712 rpm. I would appreciate any help I can get with this problem. Most likely cause?

Also discrepency between boat tach and diagnostic software tach. boat tach showing 850rpm at idle and software tach shows surging as above. Which is most likely to be correct? Software is version 4.2.

Motor only has 80 hours run time per the software.

[Danrude]

I had that problem on my old 2000 200hp I could de-carb and change the plugs and it would improve but I finally had to send the injectors to DFI technologies and one of them was bad ( low flowing.). I would do a compression check then de-carb and change the plugs then see where you are. The software would be the most accurate as far as RPM's are concerned.

[metairiedave]

Hey Dan, Thanks for the info. I appreciate all the help I can get. I will certainly try your suggestions. Will let you know the results. Thanks again.

Dave,

Metairie, La.