2004 Sea Doo GTX 4TEC Supercharged - Noise (bursts) from air intake pipe in 4000 RPM

[rtomin]

Hi guys!

I am owner of a 2004 Sea Doo GTX supercharged since 2012 with 206 hours on it and only 4 hours on the rebuilt supercharger. However it seems to have a problem that I will describe:

In the early hours, the watercraft runs normally and shows no fault, however, after 25 km from piloting the problem appears:

The watercraft starts making noises (such as bursts) in revs from 3500 until 4500 RPM, but in revs above 5000 rpm the watercraft is normal. When I removed the seat, I could see the blows coming from the air intake pipe that feeds the supercharger.
Continuing to ride, the watercraft speed is limited in revs about 5000 RPM and the blows are constant in any rotation (exception in idle speed).

No problem is detected with VKC (Vehicle communication kit), no P-code is showed in watercraft displayed and the following parts were checked / changed:

Fuel pump – new
Spark plug – new
Cables spark – checked - ok
Ignition coil – new
Air temperature sensor – checked - ok
Supercharger – new

I'm having a good support from my mechanic, however, I wonder if anyone has had a similar problem. My last option is to check the knock sensor.

Regards,

Rafael

 

[brobertov8]

I believe you already checked but, did you check the pressurization hose from the SC to the Throttle Body?

I don´t know how exactly work in this ski, but if was in a car, I would look for the "blow off" valve... Should has something like that in a SC engine.

 

[Coastiejoe]

Generally speaking, when there is an issues with the SC or any of the hoses the ski reaches around 40 ish MPH and or 5000 RPMs max. So, check all hoses, connections and the SC. remove the hose and see if he SC spins using your finger. It will, but it takes a LOT of force.


Repairing and selling iPads, iPhones and Mini iPads.

 

[rtomin]

Dear all

My problem was solved with air pressure sensor replacement (Seadoo part 420 274 057 - Bosch air pressure sensor).
There was a failure in this sensor, that wasn't detected by VKC, and made a mistake with electronic injection reading.