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Setting the timing on a 502 Mag Fuel Inj

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Old 06-16-2006, 07:58 AM
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Default 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.
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Old 06-16-2006, 10:21 AM
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Default 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.
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Old 06-16-2006, 11:22 AM
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Default Re: Setting the timing on a 502 Mag Fuel Inj

Where is the plug?

Quote:
Originally Posted by TMP racing
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.
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Old 06-16-2006, 11:41 AM
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Default Re: Setting the timing on a 502 Mag Fuel Inj

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Originally Posted by duksrule
Where is the plug?
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

Last edited by the duke; 06-16-2006 at 11:45 AM.
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Old 06-17-2006, 12:11 PM
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Default 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
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Old 06-06-2007, 09:07 PM
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Quote:
Originally Posted by duksrule View Post
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?
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Old 06-06-2007, 09:12 PM
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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
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Old 06-06-2007, 09:18 PM
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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.
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Old 06-07-2007, 12:19 PM
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I read you can't set the timing. Only read the fault codes via flashes.
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