2001 Yam OX66 VMAX 225 Shutdown

[boat614]

I am having trouble with my 225 at high RPM it shuts down like you turned it off. It does great until I attempt to fully accellerate, and before it reaches full speed it will shut down completely. None of the touble alarms ever sound off. All help will be appreciated. Thanks Matt

 

[boat614]

Re: 2001 Yam OX66 VMAX 225 Shutdown

I did forget one thing. This is an EFI engine.

 

[HeadHunt]

Re: 2001 Yam OX66 VMAX 225 Shutdown

Below are two threads about the EFI OX-66's you can read while waiting for some of the experts to chime in.<br /><br />HH<br /><br /> http://forums.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=30;t=006750 <br /><br /> http://forums.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=30;t=006514

 

[rodbolt]

Re: 2001 Yam OX66 VMAX 225 Shutdown

check your low pressure fuel pumps and the vapor seperator filter, when an EFI runs out of fuel it can be a shut down just like you switched the key, one of the big differences in symptoms between carbed and EFI.

 

[bernieb]

Re: 2001 Yam OX66 VMAX 225 Shutdown

You might consider this solution .<br /> http://forums.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=30;t=006727

 

[boat614]

Re: 2001 Yam OX66 VMAX 225 Shutdown

Rod, thanks for the help. Checked and found one of the three low press. pumps to have a blown diaphram. I havent repaired yet but I will let you know how it turns out. Thanks again!!!

 

[rodbolt]

Re: 2001 Yam OX66 VMAX 225 Shutdown

werd o advice,<br /> do all three pumps

 

[boat614]

Re: 2001 Yam OX66 VMAX 225 Shutdown

Rod definetely on all 3 wouldnt even think of doing just 1. Thanks Matt

 

[boat614]

Re: 2001 Yam OX66 VMAX 225 Shutdown

Rod I finally got the new diaphram kits and installed them, took her out and she runs like a new one. Thanks for the assistance Matt

 

[rodbolt]

Re: 2001 Yam OX66 VMAX 225 Shutdown

cool<br /> aint it amazing how quick the shut down is when an EFI motor runs out of fuel? its not a slow bog like a carb motor.

 

[boat614]

Re: 2001 Yam OX66 VMAX 225 Shutdown

Just like you turned the key off.

 

[boat614]

Re: 2001 Yam OX66 VMAX 225 Shutdown

Rod, The engine did great the first 2 or 3 times out now I noticed this weekend it acted as if I had it at full throttle at about 4500 RPM and when I backed off & got back down on it it picked on up as it should for a bit and then the same again I am thinking I still have a fuel problem? It doesnt do it until it has been run for a few minutes. Thanks Matt

 

[John from Madison CT]

Re: 2001 Yam OX66 VMAX 225 Shutdown

Did you change your VST Filter?

 

[rodbolt]

Re: 2001 Yam OX66 VMAX 225 Shutdown

sounds like your still fighting a fuel issue.<br /> any restrictions can do it as well as trash in the vst filter or clogged injector filters. each injector has a filter in it.<br /> look on the yamaha parts website and see if your filters are availible, if not flagship marine is doing a good job cleaning and replacing the injectors for 30 a piece or so.<br />but before ya drop to many nickels you need a high pressure fuel gauge and a vacum guage and a bit of knowledge about how and why EFI works.<br /> the O2 sensor test harness will be nice as well as above 4000 RPM it can lean out the air/fuel mix.<br /> but it sounds a lot like the VST filter is clogged.

 

[boat614]

Re: 2001 Yam OX66 VMAX 225 Shutdown

Rod I pulled out the VST filter today and did find a small amount of dark residue. I was able to remove the filter and clean it however it didnt look like much was there at all. It was barely even visible, but the filter did look gray in color before I cleaned it. I wasnt able to test run today but hope to by the end of the week. Thanks Matt