Shipyard Isl. Marine Engine Parts - OX66 won't fire
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05-27-2012, 03:28 PM
I noticed you give advice and sell parts for yami's. I am a customer actually. I bought alot if not all of my VST stuff from you guys in the last year. I have twin 1999 Yamaha outboards on my 26 ft boat. One engine runs after being stored over the winter and spring (even though I had to unstick the check valve and float needle) but one engine doesn't. I thought that the starboard engine(the one that doesn't run) had a seized up HP fuel pump, so I replaced it yesterday with a new HP fuel pump. Still no firing. The engine turns fine, but it won't fire off. I checked the fuel up to the fuel rail and there is gas. The schrader valve on top of the VST is pressurized with a good amount of pressure. The VST filter is clean. The gas is getting to the fuel rail, but it seems not throught the injectors !!!! There is a spark going to the plugs, which are less than a year old (recreational fishing), because I got shocked when I was holding the screw driver into the spark plug wire to the engine. Don't forget, my port engine actually runs, so any gas related theories won't fly. I have searched threads on this topic, and am leaning to an O2 sensor. And yes there was some gunk in the bottom of the VST, so I am not sure if the injectors got some of it or not, but the VST filter wasn't clogged though. And even if some trash did get through the VST filter, would it lock up ALL 6 injectors ?? The engine actually turns over quite well, it just won't fire off.
Do you have any starting fluid? If so, try spraying some in the intakes. Does it fire then? If so, the problem is fuel supply/delivery related.
05-28-2012, 12:33 PM
for some reason I feel like the injectors are either clogged/stuck (all of them I guess) or I have an electrical issue that is not letting the injectors move. I have the boat at the beach and I live inland 3 hrs, so it'll be next weekend before I get to check it again. :(
Starting fluid.....you'll know right away if it starts.
06-02-2012, 06:55 AM
Sprayed starting fluid in the throttle body (EFI) 1999 Yami saltwater series 2 outboard, and she fired right up ! Looks like my injectors are stuck or TPS or ECU ? I am working on it now as I type. Gonna start with checking each injector first. Putting 12 VDC to each one from a battery to see if they click. Gotta start somewhere !!!
06-02-2012, 08:58 AM
All the injectors were stuck. Each one of them. I put carb cleaner in each one and used jumper wires on each one until they started clicking. None of them would click with 12VDC on them until I tapped on them a bit also. Took a bit of work to get them clicking again. But she is running good now.
I'd have those cleaned ect.
06-02-2012, 04:48 PM
Thanks for your response & help Andy.