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Mercury 225 hesitates at full throttle

Changed plugs, water pump, change fuel bulb, change to high test fuel

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  • 184 Answers

Tap the choke at the moment of hesitation. If you instantly get a response, your "sync and link" adjustment needs to be fine tuned. you might have float level problems, or a minor vaccum leak.

Either way you will want to go after it as a lean mixture can be a big problem at high load figures.

Posted on Oct 14, 2012

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6 Suggested Answers

6ya6ya

6ya staff

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: I have a 2000 Mercury efi saltwater engine 250hp

Sounds like a problem with your injector or injector sensors. One of the nice things about the EFI`s are the ability to hook up a diagnostic unit to the motor and then a tech at a merc dealership would be able to tell you exactly which sensor or injector is the problem

Posted on Apr 14, 2009

fordexpert

  • 5692 Answers

SOURCE: Mercury 4hp had a spark when I used starting

The magneto or pickup coil could have been affected by the spray. When the motor turns the pickup coil reads the flywheel and produces the electricity for the coil. You may have rust on that part and the magnet in the pickup could be covered with oily rust. Test electric components and sand rust off.

Posted on Jul 09, 2009

Anonymous

  • 207 Answers

SOURCE: I have a 2000 Johnson 225 When I put it in the

when you changed thefuel water seperator did you prime the filter if not take it off and fill it with gas and make sure you lube the o ring when you pull it it should be full of gas if not you have a air leak somewhere else

Posted on Jul 10, 2009

Anonymous

  • 86 Answers

SOURCE: 2003 115 mercury efi losing power

I am a Mercury certified technician. What you need to do is take it to a Mercury dealer and have them hook it up to the computer. It sounds like the engine could be in Guardian mode or possibly a high RPM misfire. It is not something that is common and the computer program that Mercury has for those is able to test misfires and all sorts of cool stuff. It can also tell you if the engine was broke in properly, how many actual running hours are on it and even at what RPM each hour was ran. It will be able to bring up all faults that it has had in the past and any faults that are current. I know that you are probably looking for a quick, easy fix but for this problem I dont think that there is any way around taking the engine in. For what it is worth, if they charge you for more than 2 hours to run it on the computer then take it somewhere else. I can fully test the engine with the computer in about an hour. The only reason that it would take any longer is if they had to put it in the water to duplicate the problem but most shops will have a test tank that is capable of running your engine under a load at full throttle. Sorry for the bad news but I cant think of any other way and throwing new parts at it is just going to get expensive quick.

Posted on Aug 11, 2009

rgall3285

ray gallant

  • 64812 Answers

SOURCE: 1996 Mercury Mariner Magnum 225 trouble

might be fuel filter pluged.

Posted on Apr 27, 2010

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2003 115 mercury efi losing power


I am a Mercury certified technician. What you need to do is take it to a Mercury dealer and have them hook it up to the computer. It sounds like the engine could be in Guardian mode or possibly a high RPM misfire. It is not something that is common and the computer program that Mercury has for those is able to test misfires and all sorts of cool stuff. It can also tell you if the engine was broke in properly, how many actual running hours are on it and even at what RPM each hour was ran. It will be able to bring up all faults that it has had in the past and any faults that are current. I know that you are probably looking for a quick, easy fix but for this problem I dont think that there is any way around taking the engine in. For what it is worth, if they charge you for more than 2 hours to run it on the computer then take it somewhere else. I can fully test the engine with the computer in about an hour. The only reason that it would take any longer is if they had to put it in the water to duplicate the problem but most shops will have a test tank that is capable of running your engine under a load at full throttle. Sorry for the bad news but I cant think of any other way and throwing new parts at it is just going to get expensive quick.

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