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#11624991 - 05/25/16 08:39 AM Mercury EFI 200
The Lab Offline

Registered: 04/22/13
Posts: 195
Loc: Collinsville, TX
Hello, recently started having problems with my Mercury Efi 200. After the motor warms up it seems to start idling very very rough. It just started doing this. Any suggestions? Anyone know where to start so I can get it taken care of?
1996 Ranger 488VS Comanche with 1996 Mercury EFI 200.
Blue Rock Custom Tackle

#11625220 - 05/25/16 09:54 AM Re: Mercury EFI 200 [Re: The Lab]
Todd Ivins Offline

Registered: 04/10/13
Posts: 377
Loc: Boerne, TX
Ethanol problems most likely. gas lines et al need to be examined too. I gather its a 96 model?
"My Dad taught me how fish relate to structure....he left out how women relate to fishing."

#11625510 - 05/25/16 11:41 AM Re: Mercury EFI 200 [Re: The Lab]
steve@hydrodynamics Online   content
TFF Celebrity

Registered: 08/25/06
Posts: 6811
Loc: Quitman,Tx
check your spark plugs too

#11625798 - 05/25/16 01:18 PM Re: Mercury EFI 200 [Re: The Lab]
gary purdy Online   content
TFF Guru

Registered: 05/24/03
Posts: 11371
Loc: Littlefield Tx & Lake A. H. US...
Check the temp sender wire`s connection`s. Brown/white stripe top port cylinder head.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD

#11631640 - 05/28/16 12:50 AM Re: Mercury EFI 200 [Re: The Lab]
Okyakfishing Offline

Registered: 12/06/12
Posts: 303
Loc: Tulsa OK
My 200 EFI did the same thing and it was the idle screw was loose and then it actually fell out. Mechanic found it laying inside the motor. Replaced and problem went away.


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