1998 Post 42 with Volvo ECM issues

smthgspecial
Dont feel abandoned, i think 95% of us Post owners have Detroits, or Mans. Wish i could help, Wish ya the best.

Noisy or bad voltage will haunt any ECU/ECM. Before you call the expensive guys (good Volvo shop) go thru every hot and return connection thru every terminal, every splice, plug, connect, terminal strip, fuse holder or breaker, places for bad chafe on the harnesses, all wires around the alternators, pour a pot of coffee and do it again.
We have all worked and helped on ECU problems on this forum, our dock and even our own boat and found most of the problems something simple yet hard to find. Bad wire, crimp or poor V+.
ECU error codes are great for engine problems, but when it turns into an environmental or installation problem, those codes rarely come up with anything solid.
Good luck and let us know what you find.

I started a thread a few months ago asking for info on newer 42's and got nothing...I'm afraid you may be on your own as far as fellow owners. Sorry I can't contribute anything but you have confirmed my fear of early Volvo ECM issues.

Care to give me some performance specs and pros/cons of your boat?

As RC says, 90% of problems are simple connection and corrosion faults. Volvo stopped making the 72s in the mid 90s, so they are starting to get electrical problems now at this age.

Sorry to say it's going to be a long and very boring hunt. You just have to go through all the system with a methodical head on. There is no silver bullet to fix it.

I have also seen battery chargers that are passing through some a/c voltage do this to ECM's. On the 62' Sunseeker with MAN 1100 common rails I run, the port engine would throw all kinds of erroneous alarms intermittently. Couldn't figure out what it was.....turns out the fresh water heater allowed water to pass through the engine and then back. I shut the valves off and the alarms went away. So turns out it was the electric field created when the hot water heater cycled on.

There was a post several months ago about a new captain chasing battery and charger issues on an old abused DDEC system. It got long and I don't remember the outcome. I felt we all knew it was battery installation and quality problems.

Smth,
sorry for the silence, but I'm with CostalGeorge, I have not got a clue.

have you tried boatdiesel?

good luck,

RT