496 HO running rich?
I have a 09 22 Classic with the 496HO (with 200 hours) and I get black/dark residue on the stern and Corsa exhaust tips. New plugs were installed at 100 hours and 2 years ago the marina checked the motor with the Merc computer and nothing was found? Any ideas on how to get this sorted? And I don't have a oil consumption issue, thanks
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Have Whipple reprogram the ECU. There was actually an update by Merc to fix this but I doubt they will do it anymore - enter Whipple. I think its like $800
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Make sure to only run 87 octane as higher octane gas can soot the transom as well as the early programming issue.
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Check your Battery.... they are very sensitive to low batteries....low amperage puts them in guardian mode....
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What did the old plugs look like when you replaced them, what do the new ones look like now ? cold be warm up enrichment, water or air temp.
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Yep we have good stuff here on the lake (Valvtech or 90 octane rec gas) so I'm good there
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Originally Posted by GRH
(Post 4763565)
Check your Battery.... they are very sensitive to low batteries....low amperage puts them in guardian mode....
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Originally Posted by GPM
(Post 4763568)
What did the old plugs look like when you replaced them, what do the new ones look like now ? cold be warm up enrichment, water or air temp.
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If the plugs are clean, you're not running rich, could just be the nature of the beast. Good luck
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09 should have the latest calibration
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