95 dt150 help please

[Solarman]

dt150, running issues

Dk, you had mentioned this in a previous post, can you explain? Was the motor out of the water when this happened? Did the motor reach full throttle?

well I finally got to the water and absolutely no difference I unplugged the sensors to see if that let it open up but no. Here is the strange thing if I open it up all the way it advances to around 2000 rpms but that's it. if I trim it up under full throttle when it gets up a ways I think after it gets off the trim cylinders it ramps up nicely???? I'm out of ideas...... help?
thanks guys

[dkshooter]

seat removed and there was no obstructions thanks!

[Solarman]

dt150, issues

The vapor separator tank (vst) did you remove the needle valve and seat to look for anything that might cause a partial blockage on the backside of the seat, small pieces of plastic?
Still waiting to get this cleared up.
Ill look for monitor gauge tests.

[dkshooter]

gauge

no reaction from the gauge unplugging any of the sensors I did put a voltage tester on the leads in the plug and I got some strange results I was hoping you could interpret these
Ltg reads 12 vdc
Bl 12 vdc
Y .3 vdc
pink? .3 vdc
G .6 vdc
then on the outside plugs I got these
R .5 vdc
W/Bl 12 vdc
I am still trying to get the seat out (it does not want to cooperate)
thanks for your help

[Solarman]

dt150, running issues

Ok. Plug that sensor back up. Try another sensor, water temp, if no monitor check engine light try the TVs. Do all the same way, unplug and turn key to on.
Let me know if anything is under the seat.

[dkshooter]

Oops I did not pull the seat I'll go do It right now my air pressure sender is located under the oil tank but I was able to unplug it anyway the result is that there was no check engine light at all.

[Solarman]

dt150, running issues

Ok, fuel was clean, did you unscrew the needle valve seat?
Was anything on the backside of the seat?

OK. you want to test the monitor. Unplug the atmosphere sensor, located just above the TVs sensor. Then turn the key to on. Not start, just on. You should get the initial beep, then the monitor check engine light should flash. You can check the manual for the code it should flash. The flash should start over/ repeat after each sequence.

[dkshooter]

vst check

Ok I have separated the vst 8 oz. of fuel in a clear jar and nothing, clean. Same with the screen/filter. I have a serious concern with my monitor can you tell me what color wires go to what warning lights I thought I might put a voltage tester on the connector and see if I had any warning lights that might not be lighting up?

[Solarman]

'95, dt150, running issues

Ok. I need you to open the vst, and remove the needle valve, and seat. While the needle valve, seat and float are out hold the float bowl by hand in place and pump the fuel bulb several times. I'm looking for any trash on the back-side of the needle valve seat that might partially block fuel flow. After pumping the bulb, look at fuel in bowl for any trash too. While the bowl is off also look at the inline cone filter, that goes from the vst bowl to the high pressure pump. If you find any fragments of anything describe them to me (clear plastic is what I'm looking for, but anything else tell me.
Let me know.

[dkshooter]

new start

I returned all the wiring back to original last weekend seems to idle a little rough till it warms-up. when in gear it advances to around 2000 rpms but no further no bogging or missing the throttle plate opens to about 60 degrees.

[Solarman]

'95, dt150, running issues.

Let's stop revving up over 3k, on muffs, or neutral. Make sure all you're jumpers, and bypasses are back the way they should be.

It stopped running at wot, bout 7 yrs ago. Off and on till just quit.
Now in the water the motor will get to what rpm, and them it bogs out, or does it just stop increasing RPMs without bogging? Or, does it start missing like on less than all cylinders? Skipping, running rough?

[dkshooter]

thank you for understanding. the motor has always run I starts easily a little missing it will open up to 5000 rpms in neutral. I do not recall if any of the mechanics told me that only 3 cylinders were firing though I believe that is why the ECM was replaced. I can and will preform all the tests you would like but I do not own a DVA. trust me I would take the boat to a Suzuki mechanic but I have been unable to locate 1 in less than a 3 hour drive!
thank you again

[Solarman]

dt150 EFI, '95, running issues

Ok, was not aware of this history on your motor.
You must understand also, that to me every motor that is capable of running is salvageable.
In this forum it is not possible for me to put my hands on, or visually check anything. I rely on your hands and the testing you do. What the mechanics did, if they did it, I can't tell. For me to help you we have to work as a team, and I can't work on your problems if you go screwing around with other things (jumping sensors, removing parts trying to short out wires, or whatever). this motor can run if the basic engine is functional.

Now, when was this motor last started, and run, even if only idling? And I'm hopeful I can trust my eyes, ears & hands to get this all done.
If I can't trust these things, then your best direction is to drive this boat to your nearest Suzuki dealership and tell them to fix it.
I do not recommend scrapping the motor.

[dkshooter]

I understand

all I would like from you Please! Is do I just junk this motor and take the loss????
again thank you for all the help!

[dkshooter]

the whole story

Ok I have told this story several times I thought this thread was one of them he is the story of the motor I will try to keep it short! About 7 years ago the motor was running great and I was very happy. then in the spring the motor was running at WOT one day and it suddenly dropped to around 2500 rpms no alarms or lights I shut down and restarted it jumped right back up on plane and all was good this series of events became more frequent finally no response above 2500 under power in the 7 years I have had mechanics replace or clean the following I cannot remember what order these were done the high pressure fuel filter replaced, both low pressure fuel pumps rebuilt spark plugs replaced, high pressure fuel pump replaced, ignition control unit replaced. that was the last straw it was last year so I decided it was time for me to do something So over the winter I contacted Suzuki corporate they informed me the best they could offer me is a Retired guy that lives 1 1/2 hours from my house I called him he said no thanks So I am trying to fix it my self sorry for my frustration!! all I have done with this motor is test everything I can think of I really don't wont to waste your time or mine I just need help!!