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496 EFI to carb

Old 10-21-2010, 02:29 PM
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Default 496 EFI to carb

Posible to go from EFI to a carb on a 496 HO mag?
$800 to reflash the computer to help with the smutty black swim platform.
$800 will sure buy a nice carb, sell the ECM and it will pay for a full MSD set up.

Have not looked at the gaskets to see if the EFI intake has the same lay out.
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Old 10-21-2010, 02:41 PM
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Originally Posted by Waterslinger
Posible to go from EFI to a carb on a 496 HO mag?
$800 to reflash the computer to help with the smutty black swim platform.
$800 will sure buy a nice carb, sell the ECM and it will pay for a full MSD set up.

Have not looked at the gaskets to see if the EFI intake has the same lay out.
what fuel are you running,,premimum fuel will do that..
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Old 10-21-2010, 02:51 PM
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Tank full of 87 and it is crazy smutty.

496 head will not take a carb intake see pic CRAP

http://www.offshoreonly.com/classifi...o36335-en.html
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Old 10-21-2010, 04:26 PM
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i knew that one already you can have one made but by the time converting it all over and you will need a new ignition system also you may as well have it tuned..
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Old 10-30-2010, 04:56 PM
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You just need to find a dealer or Mercury service tech who can reflash your PCM to a newer calibration. Newer cals are leaner and won't soot as much on your transom.
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Old 10-30-2010, 05:56 PM
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also check fuel pressure,,,and pressuse regulator
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Old 10-31-2010, 08:58 AM
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I say leave it efi,

what year and is it a mag or a mag Ho?
I have a couple 555 ecus reflashed by merc with the sooting update from 2003 496 mags ,I would sell you on for half the cost of reflashing yours.
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Old 11-01-2010, 06:24 AM
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its a 496 MAG HO think its a 03 or 04, has aluminum manifolds
think 05 is when Merc went to cast iron manifolds right?
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