Motor Surging at idle

robayles

Seaman Apprentice
Joined
Apr 17, 2004
Messages
46
I have a 1997 Evinrude 225 Oceanpro and am having issues with cold start up idling. I leave my boat in the water during winter and, go down and crank it up every weekend to let it run a while. Recently I've noticed that it starts up fine but after a minute or so of idling it begins to surge. It sounds like the motor is idling down to get out of quick start but then idles back up. Every couple of minutes the motor will cut out. It restarts fine but goes through the same idling sequence again. I've noticed that when it does that surge that it shoots a good bit of water out of the exhaust ports (at rear of engine on each side of pee hole outlet).<br /><br />Could this just be cold start or could something else be happening. I haven't taken it out and run it lately due to the cold weather.<br /><br />The Big O
 

Ranger01

Petty Officer 2nd Class
Joined
May 31, 2005
Messages
106
Re: Motor Surging at idle

At first i was thinking a fuel problem, but ya threw me with the good bit of water. I'm anxious to see what others may have to say about this... Good luck.
 

OBJ

Supreme Mariner
Joined
Dec 27, 2002
Messages
10,161
Re: Motor Surging at idle

Big O...is the engine warming up at idle? Check both heads. What are the rpms during the surgess?<br /><br />The increase of water flow during the surge may be just from the increase of rpms or a stuck open t-stat.
 

robayles

Seaman Apprentice
Joined
Apr 17, 2004
Messages
46
Re: Motor Surging at idle

OBJ,<br /><br />At start up the RPM is around 1100 and then drops to around 700/800 rpms or at least tries to but then wants to rev back up. Good suggestion on the open thermostats. I last changed them a couple of years ago. Might be time to change them out.
 

OBJ

Supreme Mariner
Joined
Dec 27, 2002
Messages
10,161
Re: Motor Surging at idle

If this is a salt water boat, I would take a look Big O.
 

robayles

Seaman Apprentice
Joined
Apr 17, 2004
Messages
46
Re: Motor Surging at idle

It is a saltwater boat. I'll give them a look this weekend. Thanks.
 
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