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#10880385 - 05/29/15 09:33 AM Mercury 225 Started slowing down??
cwoodfishing Offline
Outdoorsman

Registered: 04/06/12
Posts: 159
I have a 2001 mercury 225. I was in a night tournament last night and when I was coming in to weigh in I noticed my boat started decreasing in speed from about 68mph to 48mph and the rpms decreased from 5800 to 4900. I had the trim up and foot in the throttle and that was just all it was doing.

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#10880537 - 05/29/15 10:17 AM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
boatmannmike Offline
Outdoorsman

Registered: 02/03/15
Posts: 48
carbed, EFI, or DFI. more information needed

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#10880696 - 05/29/15 10:59 AM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
Matt M Offline
Extreme Angler

Registered: 12/09/07
Posts: 2301
Loc: Rockwall , tx
1000 rpm drop you could have lost 1 cylinder either a coil, plug, fuel delivery to that cyl or that nasty B word no one like to hear (blown up) start with spark and compression test

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#10881524 - 05/29/15 04:01 PM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
cwoodfishing Offline
Outdoorsman

Registered: 04/06/12
Posts: 159
I did a compression test and all cylinders are equal at 118. The motor is efi.

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#10881758 - 05/29/15 05:35 PM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10509
Loc: Littlefield Tx & Lake A. H. US...
Check the lower unit.
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#10883574 - 05/30/15 01:06 PM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
boatmannmike Offline
Outdoorsman

Registered: 02/03/15
Posts: 48
Along with all fuel filters,,, including the ones you cant see. Also could be you are dropping fuel pressure due to a sticking regulator.

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#10885581 - 05/31/15 03:38 PM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
Larry Mosby Offline
Outdoorsman

Registered: 12/11/14
Posts: 86
Loc: Rusk County, Garrison, Texas
First check your fuel filter, then check to see if you have fire on all cylinders. Next you would have to do a voltage test on your regulators. If a regulator goes bad it will usually look kinda burnt. Your engine should have two and they are easy to replace. Bad regulators are known to cause a power loss on the top end of the power band. In checking your fuel filter remove it and blow through it in the opposite direction of the flow arrow, this should show you if it is clogged. Sometimes a crystal build up will occur and it can be removed by holding the filter with the flow arrow pointing up and lightly tapping the side of it to knock loosely any of this residue. Do this repeatedly until you can blow through it without straining.
_________________________
Larry Mosby

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#10886099 - 05/31/15 08:17 PM Re: Mercury 225 Started slowing down?? [Re: Larry Mosby]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10509
Loc: Littlefield Tx & Lake A. H. US...
Originally Posted By: Larry Mosby
First check your fuel filter, In checking your fuel filter remove it and blow through it in the opposite direction of the flow arrow, this should show you if it is clogged. Sometimes a crystal build up will occur and it can be removed by holding the filter with the flow arrow pointing up and lightly tapping the side of it to knock loosely any of this residue. Do this repeatedly until you can blow through it without straining.
Crystal? This motor has a large spin-on fuel filter? If lower checks out good start checking each cylinder for hitting. These years motors have a problem with the coils.


Edited by gary purdy (05/31/15 08:25 PM)
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#10887761 - 06/01/15 01:49 PM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
PlanoKeith Offline
TFF Team Angler

Registered: 01/13/11
Posts: 3408
Loc: Plano Texas
Did you happen to notice the voltage dropping? If so check and make sure the alternator is working properly. . The 225 EFI has the voltage regulated through the Alternator. ( no voltage regs ) If the alternator is not working it will drag the motor down and will be running off the battery and stator ONLY which is not near enough voltage to run the Merc 225 EFI.
_________________________
Keith smile

www.moestackleshop.com

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#10888468 - 06/01/15 06:41 PM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
TLW Online   content
Extreme Angler

Registered: 11/16/06
Posts: 2004
Loc: ft worth
think reg efi stator and 2 rec/reg..opti's had alt...


Edited by TLW (06/01/15 06:55 PM)

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#10888631 - 06/01/15 07:44 PM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
Freeman Clark Offline
Extreme Angler

Registered: 03/18/05
Posts: 1254
Loc: Temple, Texas
I would say the good lord was looking out for you.NO one in there right mind will be running 68 mph at knight.

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#10888636 - 06/01/15 07:46 PM Re: Mercury 225 Started slowing down?? [Re: Freeman Clark]
Dubee Online   content
Extreme Angler

Registered: 07/17/11
Posts: 1197
Loc: Godley Tx
Originally Posted By: Freeman Clark
I would say the good lord was looking out for you.NO one in there right mind will be running 68 mph at knight.


I do all the time

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#10888672 - 06/01/15 08:05 PM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
wkh2006 Offline
Outdoorsman

Registered: 04/22/10
Posts: 216
Loc: Atoka, OK
I'm with Gary these motors did have coil problems. And your motor does have an alternator and more than likely is NOT your problem.

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#10888741 - 06/01/15 08:37 PM Re: Mercury 225 Started slowing down?? [Re: cwoodfishing]
TLW Online   content
Extreme Angler

Registered: 11/16/06
Posts: 2004
Loc: ft worth
sorry, gettin' dyslexic........along with everything else fallin' apart! agree with tha coil thing being suspect.....


Edited by TLW (06/01/15 08:43 PM)

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#10888770 - 06/01/15 08:47 PM Re: Mercury 225 Started slowing down?? [Re: Freeman Clark]
kingdad101 Online   content
TFF Guru

Registered: 10/24/05
Posts: 20708
Loc: W.F. Texas
Originally Posted By: Freeman Clark
I would say the good lord was looking out for you.NO one in there right mind will be running 68 mph at knight.



Quote:
I was in a night tournament last night and when I was coming in to weigh in


lots of night tournys I've been in have a 8.00AM weigh in..or other day light time...

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