If your engine guy is tuning with mefi burn you can erase the existing tune then download a merc 500 tune and start from there bob from mefi burn has a lot of tunes that can be set thru e-mail

Have to get it unlocked first.

You don't need to unlock it in order to wipe it clean.

Did you say that it's a Mefi 1 or 2? It's been a LOOOONG time since I messed with a 1 or 2, but I don't think they are password protected. Are you sure it's not a Mefi 3 or 4. If you can give me some specs on the engine, I would be glad to see if I have a cal that will get you close so that you can tune it from there. Give me a shout if I can help.
Eddie

Eddie, you never seem to amaze me when it comes to your generosity of helping others.

Mefi2 Eddie. Thanks I will get back to you.

I had the same thing happen when I re-flashed my 575's. I have MEFI burn and wanted to enhance the program a bit after finding that it was set to idle at 1200rpm (my boat has bravo XR's and this would murder them). Called the shop and was told to send them back and they would fix them it was most likely my IAC controllers (2) per motor that were bad. Long story, and arguing, I replaced the IAC's @ $120 EA and still have a high idle. Send the ECM's back, and boom... fixed. Mind you, I plugged into each motor and could see what in the CAL was causing it but couldn't unlock them to "fix/save/flash" them. Asked for the password and got the same story... its a highly sought after flash, you will sell it, ect... Ummm... no, I want to tune my boat even better, you are multiple states away, I have the knowledge and hardware to finish tune it to my liking.. nothing more... nothing less. Never got the code... very disappointed considering I think there is more in my motors based on my AFR's...

Mind you... my motors are no longer near stock form...

Exactly ! I just want to tune MY ECM and MY ENGINE to run the best i can. Not justthow a tune at it and hope for the best! I've heard and read the horror stories about this. I am holding back on saying who the company that locked my ECM is until I give them a chance to right this.

Could a Volvo dealer wipe it/ overwrite with a stock tune to get you back to square one?

Seeing if this can be done. I have people looking into all aspects. Beleive me!

awesome......