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Mercury 225 Started slowing down??
#10880385
05/29/15 02:33 PM
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Joined: Apr 2012
Posts: 175
cwoodfishing
OP
Outdoorsman
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OP
Outdoorsman
Joined: Apr 2012
Posts: 175 |
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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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10880537
05/29/15 03:17 PM
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Joined: Feb 2015
Posts: 49
boatmannmike
Outdoorsman
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Outdoorsman
Joined: Feb 2015
Posts: 49 |
carbed, EFI, or DFI. more information needed
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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10880696
05/29/15 03:59 PM
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Joined: Dec 2007
Posts: 2,319
Matt M
Extreme Angler
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Extreme Angler
Joined: Dec 2007
Posts: 2,319 |
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
Matts Marine Service 903-450-3539
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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10881524
05/29/15 09:01 PM
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Joined: Apr 2012
Posts: 175
cwoodfishing
OP
Outdoorsman
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OP
Outdoorsman
Joined: Apr 2012
Posts: 175 |
I did a compression test and all cylinders are equal at 118. The motor is efi.
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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10881758
05/29/15 10:35 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
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
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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10883574
05/30/15 06:06 PM
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Joined: Feb 2015
Posts: 49
boatmannmike
Outdoorsman
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Outdoorsman
Joined: Feb 2015
Posts: 49 |
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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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10885581
05/31/15 08:38 PM
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Joined: Dec 2014
Posts: 601
Larry Mosby
Pro Angler
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Pro Angler
Joined: Dec 2014
Posts: 601 |
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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Re: Mercury 225 Started slowing down??
[Re: Larry Mosby]
#10886099
06/01/15 01:17 AM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
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.
Last edited by gary purdy; 06/01/15 01:25 AM.
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
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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10887761
06/01/15 06:49 PM
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Joined: Jan 2011
Posts: 3,608
PlanoKeith
TFF Team Angler
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TFF Team Angler
Joined: Jan 2011
Posts: 3,608 |
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
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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10888468
06/01/15 11:41 PM
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Joined: Nov 2006
Posts: 2,850
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,850 |
think reg efi stator and 2 rec/reg..opti's had alt...
Last edited by TLW; 06/01/15 11:55 PM.
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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10888631
06/02/15 12:44 AM
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Joined: Mar 2005
Posts: 1,382
Freeman Clark
Extreme Angler
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Extreme Angler
Joined: Mar 2005
Posts: 1,382 |
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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Re: Mercury 225 Started slowing down??
[Re: Freeman Clark]
#10888636
06/02/15 12:46 AM
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Joined: Jul 2011
Posts: 5,291
Dubee
TFF Celebrity
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TFF Celebrity
Joined: Jul 2011
Posts: 5,291 |
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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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10888672
06/02/15 01:05 AM
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Joined: Apr 2010
Posts: 223
wkh2006
Outdoorsman
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Outdoorsman
Joined: Apr 2010
Posts: 223 |
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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Re: Mercury 225 Started slowing down??
[Re: cwoodfishing]
#10888741
06/02/15 01:37 AM
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Joined: Nov 2006
Posts: 2,850
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,850 |
sorry, gettin' dyslexic........along with everything else fallin' apart! agree with tha coil thing being suspect.....
Last edited by TLW; 06/02/15 01:43 AM.
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Re: Mercury 225 Started slowing down??
[Re: Freeman Clark]
#10888770
06/02/15 01:47 AM
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Joined: Oct 2005
Posts: 20,755
kingdad101
TFF Guru
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TFF Guru
Joined: Oct 2005
Posts: 20,755 |
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 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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