PDA

View Full Version : 250XS throttle position not matching power


ucf_motorcycle
09-18-2011, 07:07 PM
I have twin 2004 250XS. One of them is low on power and it seems like wherever I put the throttle it is much lower on RPM and fuel flow then the other engine. I have verified that the cables are adjusted and both engines are getting wide open. But the weaker one is almost 1/3 less fuel flow and much less power at WOT.
THe engine otherwise starts and idles fine, doesn't bog down and no alarm codes. Any ideas?
Port Monster
09-18-2011, 08:33 PM
TPS adjustment??
ucf_motorcycle
09-18-2011, 08:42 PM
Sounds like it I agree. Can I do this myself or do I need the Optimax Scanner? Any info on the procedure?
Port Monster
09-18-2011, 09:05 PM
Can't help you with that. But I am sure that there is someone on here that can.
ucf_motorcycle
09-20-2011, 07:43 PM
Can't help you with that. But I am sure that there is someone on here that can.

Can anyone tell me how to check and/or adjust a TPS on an optimax?
Port Monster
09-20-2011, 08:23 PM
Here is a link to an old mercury service bulletin for EFI TPS that will give you an idea but not the specifics.
http://www.outboardshop.com/bulletins/servicemermar/bullet/96/ob96_03.pdf
merctech5591
09-20-2011, 08:31 PM
there is no adjustment on a opti tps sensor. you will need a ddt or cds system to check output voltages. the link arm for the tps is not adjustable. you need to verift that you are not being sent into guardian for some other reason. if you do get a ddt run the motor under normal operation and check voltages and availible power.
Port Monster
09-20-2011, 08:37 PM
I knew if I kept spewing crap someone would jump in and help!! lol
Mr. Demeanor
09-20-2011, 09:01 PM
You have two motors. Swap your sensors port to starboard and see if the problem follows.
ucf_motorcycle
09-20-2011, 09:22 PM
I don't have a ddt but I do have a whole spare motor maybe I can just swap the TPS. Where is it located on these engines?

ALso I don't think it is going into guardian mode as there are no alarms. Or will it go into guardian mode without alarms?
ucf_motorcycle
09-20-2011, 09:23 PM
You have two motors. Swap your sensors port to starboard and see if the problem follows.

I actually have 3 engines :). So all I need to know is what I am looking for, where is the TPS on these engines?
rchevelle71
09-21-2011, 03:05 PM
Should be connected to a throttle shaft somehow?
merctech5591
09-21-2011, 04:53 PM
it is located on the port side of the motor above the vst. it will have a 3 wire connector and is held to the block by 3 screws. it will also have the throttle link connected to it.
ucf_motorcycle
09-21-2011, 09:29 PM
it is located on the port side of the motor above the vst. it will have a 3 wire connector and is held to the block by 3 screws. it will also have the throttle link connected to it.

Thank YOu I will swap them out this weekend and give it a try, I'll let you guys know the results.
ucf_motorcycle
11-12-2011, 07:20 PM
It was the TPS engine runs great now....now I have to figure out whats wrong with the other side.