I have about 45 hours on this 2020 175 hp Mercury pro xs(2B638314)It has started to idle rough ( shaking) and when I put it in gear it gets worse, but when I give it gas it runs perfectly. No loss top end or hole shot, just the rough idle. I don’t understand what’s going on. Can anybody help?
Last edited by Jnlp9248; 10-18-2020 at 11:25 AM.
You’ll have to post your motor serial number before you’ll get much info.
2022 Phoenix 919 Pro XP
2022 Mercury 225 4s 3B133405
Edited post to include serial
Wow.....please keep us informed on outcome!
Frank
First thing I would be doing was inspecting the plugs and plug wires. You should get the engine in to an Authorized Mercury Dealer for inspection, however.
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
Any updates on this issue?
Sorry haven’t got back in awhile. Just talk to dealer yesterday, he said they don’t know what’s going on. He said compression is different and he said they were on the phone with Mercury trying to figure it out. So I don’t know yet!
Last edited by Jnlp9248; 11-17-2020 at 06:18 PM.
Interesting if compression is just a bit out from each other or a lot? Please keep us informed.
Well boys, new power head on its way!
Wow.....just wow....
Glad they've got the ball rolling for you.
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
I have no idea what caused this. The dealer indicated that he didn’t have a clue. One of the cylinders is losing compression is all I know. He did mention carbon build up if that rings any bells to any of you. Let me know what y’all think.
Only thing can say is that a leakdown test would assist in determining "where" the excessive leakage is occurring (it will not, however change the outcome needed: Powerhead replacement).
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
I just hope the same thing doesn’t happen with this new power head. I’m just glad it’s warranty work!
Pretty unlikely to see another one... haven't seen much for problems out of these.
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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