Setting the timing on a 502 Mag Fuel Inj
 

Is there anything special that need to be done to a Fuel Injected 502 to set the timing? I am guessing something needs to be unplugged or capped off like on a car.

Re: Setting the timing on a 502 Mag Fuel Inj
 

If you do not have a plug with the jumper wire to plug into the data plug, then you can use a paperclip. Start the engine, then insert a bent paperclip into the terminals labeled A and B. This will put the computer in base timing mode. Now set the timing to 8 deg. You may have to raise the rpm to about 1500 to stabilize the timing. When it is set, remove the paperclip.

Re: Setting the timing on a 502 Mag Fuel Inj
 

Where is the plug?

Re: Setting the timing on a 502 Mag Fuel Inj
 

Comes off the computer that is mounted on your port exhaust manifold. Its a big waterproof plug thats hard to miss.

#5 in the picture
http://www.mercruiserparts.com/Show_...NESS+%28EFI%29

Re: Setting the timing on a 502 Mag Fuel Inj
 

Found the plug but which wires get jumped together? I have about 6 wires in that plug

Oh man, I searched and found the thread I needed, but no answer? What wires do I jump to set the timing?

see post # 2 this thread

I found it:

http://www.offshoreonly.com/forums/s...d.php?t=103342

It even has a picture of the plug with pins A and B shown.

I read you can't set the timing. Only read the fault codes via flashes.