E controls totally taken apart for repair above pics. These ecms are installed for Volvos Penta s -- Ilmors -- Pleasure Craft marine -- Crusader - Indmar. Will add not one other person repairing these in the USA - but take a guess who is ?

MEFI s I can pull any part off the ceramic circuit board with out issue 92 percent of the time. There is false info someone whom says that can not be done ever. That is wrong info and outdated info. I think that needs to be brought up for boaters who are having issues with MEFI ecms and or running issues that can be traced backed to the ecm.. They ( MEFI s) do get injector driver issues and also voltage regulating issues seems to be common issues.

700 SCI upgrade STAGE 3 point 5. for twins
https://cimg8.ibsrv.net/gimg/www.off...92cb3401f0.jpg

https://cimg3.ibsrv.net/gimg/www.off...a757f9d4a8.jpg

I laugh at that pic 3 or 4 years ago. rebuild the carb for a boat that would not start because no delivery of fuel and then hop over to repairing a hp 525 PCM 555 with a BAD FUEL PUMP driver that fuel would never stop pumping. . Only in the boat world would one see that. Then we have 40 year old carb design still running around on the waters vs a computer control engine in almost modern years.

where can i get this PCM 866090T05 ina matter of overnight is the lead time always 5-6 days .... `I ahve the same problem as above thanks

Have the same problem

Same EXACT Issue with 496 Mag non HO
 

I'd like to send my PCM to BUP for repair, as well.
Can someone please send me his contact info?

Search for Boats Unlimited it shows up John is in Texas

https://www.boatunlimited.com/

2006 496 Mag - Same problem!
 

I read this forum and I have the exact same issue on my 2006 Sea Ray 496 MAG. I have the same issue with the dealer essentially giving up without being able to figure it out. I saw you mentioned you could potentially look at my PCM, is this something you still work on? I would be very interested in sending mine to you to look at.

BUP do you have contact information? I have the same problem and would really like to send my PCM your way

see ray he was banned a long time a go for misconduct of forum rules

Hello There,

I replaced my PCM on the Mag 496 part 866090-003 with the Mercruiser one on their parts page 866090T05 -, It is working fine and all problems resolved , but i have feeling there is performance decline in top speed and acceleration- or their supposed not to be ? or the same Can anyone advise please I could not find the 866090-003 on mercruiser site 🙏