Engine struggles to get on plane Engine struggles to get on plane
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Boats and Motors

    Engine struggles to get on plane
from EdF  
8/18/2012 4:23:27 PM

Rated:

 For sevral months I have had a problem with my 2000 Mrc 200 EFI getting on plane sometimes. It is always after I have been fishing for about 30 minutes or more and start to leave. The boat with start to rise and them lose RPMs and drop back. Most times it will start back up and take off. More recently, if I hold the hot foot down, it might go up and down up to three times before the engine dies. When it finally gets on plane which is most of the time, it runs fine.


Today when it was struggling to get on plane, I noticed the volt meter was all the way to the left which is only 8 volts.


I thought this was fuel related because when I had my fuel lines replaced earlier this year, Mercury had some bad lines and that caused a similar problem. I now have good fuel lines.


Could a bad starter battery or a not fully charged battery cause this? I have had the battery load tested at two different dealers and they say it if OK. I suspect the charger because at times it shows the starter is fully charged when I hook up the charger. Today I swapped the charger leads so I can see if the starter battery gets a full charge and one of the trolling batteries starts to have a problem.


Suggestions appreciated. Thanks, Ed


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   Engine struggles to get on plane from Mike1957 #11182 #11182  8/18/2012 4:46:56 PM
 It is possible it could be a bad starting battery. Your outboards charging system if it is working properly should charge the battery back up enough for the ECU to get the proper voltage to function. How old is the starting battery? It is possible also it could be a fuel problem.


   Battery from Dwight #10907 #10907  8/18/2012 8:04:34 PM
  If the battery tested OK check all the terminal connections at the battery. Clean them and hook them back up with the motor cables first then the others with the biggest first down to the smallest on top. Then check for a lose or dirty connection under the cowl. Check the big plug under the cowl and make sure its clean and tight. It should have a clamp on it to keep the halves from seperating.

Edited 8/18/2012 8:08:18 PM


   Same exact symptoms from Jeff Hahn  8/18/2012 9:48:13 PM
 I had the same exact symptoms with my 1991 GT 150. It would run fine most of the time, but every other trip or two, it would struggle to get on plane, die, the struggle again, and finally take off and run good the rest of the day.


Turns out the ethanol in the gas had softened the carburetor gaskets. They were so soft that sometimes when motor tried to pull fuel and air into the carburetor, the soft gasket would get in the way and make the engine struggle.


Since your motor is an EFI, it could be a very similar problem. I would bet money that your problem is fuel related, rather than electrical.


Jeff Hahn


   that being said from Randy B  8/19/2012 8:40:32 AM
 You may have two problems.


While everyone should have clean battery connections and good quality batteries, I don't think that will fix this problem. Once the engine is running, the cranking battery has don't it's primary job and the alternator/generator/magneto should be putting out 13.8V (or thereabouts).


My thinking is that if your starter battery is able to start your engine, it had enough charge.


The 8V issue may be related or it might not be. It won't hurt to fix that problem and get it out of the way. Does that engine have a ECM/ECU that captures and logs faults. If so, the diagnostics would show if there's a voltage issues within the engine.


   If you haven't replaced the fuel pump, you should from Brad  8/19/2012 10:31:19 PM
 those diaphrams get stretched out over time..Particularilly, post-ethanol.


   try this from Dwight #10907 #10907  8/20/2012 10:17:27 AM
 If its happening after setting for 30 min. or more try pumping the bulb before you start. They have had trouble with fuel evaporation/vapor lock with some efi and carb motors. Also make sure to trim down so motor is level when starting.


   Dude take it to a good shop from fatboy #9897  8/20/2012 4:52:45 PM
 Sounds to me as if you may have more than one problem. In the lone run this should be cheaper that just throwing parts at it.


When you find out what the problem is you might be able to install them yourself.


Please post a update as to what you find.


   Could also be a from GITTHENET  8/23/2012 1:08:08 PM
 power pack. I had one fail me one time that behaved similarly. Would start, run fine, but as soon as I accelerated / put the motor under load, it just would not plane off. Once I was beyond a certain RPM range, it would continue with no problems, or at least till I started to plane again.


Threw me a curve... I was thinking it was the fuel pump or carbs...


   Battery charger from derick881 #19465  9/30/2012 10:24:33 PM
 The way to check if the battery charger is working is with a digital volt meter. A fully charged battery will read 12.6 to 12.7 volts. While the charger is charging you should get a reading around 14 volts.


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