1998 DT225 RPM issues

[wbas1]

I was looking for some help on an issue I am having. I have a 1998 DT225 Suzuki EFI and I cannot get the boat past 1000 RPMs under a load. In neutral all is fine. I have looked all over the forums and cannot seem to find a solution. I have changed the following this winter. Plugs, Oil Sensor, water separator & checked the fuel. I am going to change the fuel filter to see if that helps. Any direction would be greatly appreciated.

 

[99yam40]

under load the motor needs more fuel.
make sure the high pressure pump is keeping rail pressure in spec.

I know nothing about your Susuki, but some motors will keep RPM down if there is a failed sensor the ECU needs to be seeing working correctly

 

[wbas1]

under load the motor needs more fuel.
make sure the high pressure pump is keeping rail pressure in spec.

I know nothing about your Susuki, but some motors will keep RPM down if there is a failed sensor the ECU needs to be seeing working correctly

That will be one of the tests that I will run. I am checking the fuel filter tonight.

 

[dingbat]

When did it start acting up?
Have you checked the compression?

 

[wbas1]

When did it start acting up?
Have you checked the compression?

It started the end of last year. Had the boat for a couple months then the last trip out it acted like this. we put it in the water yesterday and gave it gas and it only went to 1000k. No backfire no bog nothing. I am checking compression tonight

 

[flyingscott]

Compression and spark test must be done. Sounds like you are not running on all six cylinders. Neutral revving means nothing!

 

[wbas1]

Compression and spark test must be done. Sounds like you are not running on all six cylinders. Neutral revving means nothing!

Compression is 120psi on all cylinders.

 

[wbas1]

It started the end of last year. Had the boat for a couple months then the last trip out it acted like this. we put it in the water yesterday and gave it gas and it only went to 1000k. No backfire no bog nothing. I am checking compression tonight

Compression is 120PSI on all cylinders.

 

[wbas1]

I just tested spark and see I have no spark on the STRBD side of the motor. I am assuming it is in limp mode for some reason.

 

[wbas1]

Compression is 120psi on all cylinders.

No spark on the strbd side

 

[wbas1]

Update:
I found that the STRBD side Cylinder temp sensors connection was loose. I made a better connection and I once again have spark on the STRBD side.