Help - The engine is not working correctly at low rpm

[iautran]

Hello
I have a problem on a 2001 GTX DI

The engine dribbles (grazes) at low rpm. It does not take its revolution at low rpm (if I accelerate at low rpm, I feel that it does not turn round).
At full throttle, it goes very well.


I read that it could be the fuel pump but I have a doubt because when I put the key in, I can hear the noise that sends the fuel.

I have been told about the injectors but in this case, I think that the problem would also be present at high speed (which is not the case).

I notice that the spark plugs remain wet.

Would you have any other suggestions to help me find a solution?

Thank you very much!

 

[1of500]

I have no idea what dribble and grazing is on an engine.

 

[iautran]

Hello,

I am really sorry, English is not my first language and I used online translators to find the right terms.

The problem on my seadoo is that whenever the engine is running slowly (when I am at a low speed level so), the engine doesn't turn round and the jetski has difficulty to accelerate; at a higher speed, everything is ok.

If you know the right term to use, I'll be happy to use it.

Thanks a lot

 

[1of500]

Sounds like you mean it hesitates at low speed when you push the throttle?

 

[Lothsahn]

Have you rebuilt the carburetor using genuine mikuni parts?

 

[POPPS]

Its DI...so you can't rebuild the carbs,,,if the fuel pump was weak,,,or the regulator was weak,,it would not reach top end,,.almost sounds like an injector is leaking,,,

 

[iautran]

Thank you all for your answers.

I tend to agree with popps' analysis.

However I think that if it was an injector problem, I should not normally find the spark plugs wet, no?

Could it be an ignition problem? If so, how can I check it?

Someone else told me about a problem with the mixture between the air and the petrol.

What do you think?

 

[POPPS]

It possible the air regulator is not working,,,or the air compressor is not putting out enough air to atomize the mixture,,that fuel rail has somany components,,,if you could find someone to swap wth,,,that would be great.,,
It its not ignition i don't think because you sre reaching WOT..bad ignition would cause stutter and cut out at wot,,,i don't think its the because you are to go WOT...when those pumps go,,,you can barely advance,,,(in the water under load)
Have changed the plugs,,,but then a bad plug would not let you rev out?
Maybe tps,,,or other sensor,,,i believe the air intake has at least 2 sensors in addition to the tps...you may need the BUDS.

 

[Poormanracing]

Check reed cages on dis no fuel goes into reed openings and have seen a bunch of di run poorly off idle because reeds are not opening and not letting air pull thru

 

[iautran]

Check reed cages on dis no fuel goes into reed openings and have seen a bunch of di run poorly off idle because reeds are not opening and not letting air pull thru

Thank you, this sounds like an interesting lead.
Do you know what checks I can do to see if it comes from this part ?
Can you tell me what this part is connected to next?
In the view that I have retrieved I can't find the information.

Thanks

 

[Poormanracing]

Remove air box slide throttle body off get a mirror and a light and look into reed cage

 

[iautran]

Thanks a lot; I will Check it tomorrow