John B

Mercury's newest 525 apparently can reduce its power output in the event of a problem. Mine says it's reduced to 90 % and it stalls and idles a little rough. The scan device however won't tell you what caused the reduction so you can't fix it, cool! They don't seem to have the service manual completed either. So I can sit and look at my new defective boat and wait for them to figure their 555 system out. Anybody got any ideas?

bouyhunter

how did you find out it's reduced to 90% - I just have an old 454 - 330 hp - I don't underatsand all this ne sh*t./.....

John B

You need the Mercury scan tool which reads the ecm. The display screen reads the computer and gives you this type of information. But it doesn't seem to give you, at this point, enough to fix some problems.

Too Old, They are working on it. I'll let you know what and when we find something out.

John B

Who put the black spot on this post? What does it mean?

MissHavasuCig

Merc just sent out a new HP500 efi to replace the port motor in our boat that was having problems. I would talk to your dealer and see what they can get Merc to do for you. Good luck.

Havasu Cig

The last post should have been under my name.....