2003 Merc 200L EFI , Ser # OT761171 125 psi on all 6 cyl., 2-3 psi wp @ idle, 8-10psi @ 5200. 1998 R93 Ranger Prop.: Tempest 48-825872 24P 14.5 "
Just blew a 20 amp fuse under the hood on starboard side of engine. Replaced that: engine starts good hot or cold , idles a bit rough but idles, slow out of the hole compared to what it used to be. Top end does seem to be affected( 5200rpm ). Any ideas?
Last edited by Seymourbass; 08-19-2019 at 10:04 AM.
5200 is about 600 too low,start with basics compress, spark on all 6, fuel delivery
.................................................. ...the scariest thing in life is the unknown ...................................
Especially the spark test. Something caused the blown fuse.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
make sure it has the resistor spark plugs, or it will run like crap,
Thanks for the tips. I found cracked/leaking ignition coil (P/N: 8M0077471). Replaced it, and that took care of the problem. Good out of the hole and 5800 rpm top end. Thanks again
5800now we cookin with gas
.................................................. ...the scariest thing in life is the unknown ...................................
For future reference would someone in the know please post OHM / Pin # values for a good 8M0077471 Mercury coil? Thanks
See Service Manual (or SB 2007-025 if you can find a copy). Can't publish those here as they are copyrighted.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
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