Vacuum hoses

[Idh]

I have the air filter out. When I manually push the secondaries closed, the shaft for the STPS rotates, but when I turn the ignition on, nothing moves.

[Idh]

I have the air filter out. When I manually push the secondaries closed, the shaft for the STPS rotates, but when I turn the ignition on, nothing moves.

Just to add more, with ignition on, I hear the fuel pump priming etc. With a torch into the airbox, I can see that the valves don't move during this priming process. Closing no3 by hand does move the STPS shaft.

[imweirdimnotsocial21]

I have the air filter out. When I manually push the secondaries closed, the shaft for the STPS rotates, but when I turn the ignition on, nothing moves.

Just to add more, with ignition on, I hear the fuel pump priming etc. With a torch into the airbox, I can see that the valves don't move during this priming process. Closing no3 by hand does move the STPS shaft.

Ah, there's your fault right there. You have no FI light and any codes?

The STVs should cycle whenever you turn the ignition on and the fuel pump is priming.
I am not sure how to diagnose that but I believe that is something that is not easy to trouble shoot.

I would recommend you check from the right hand side of the bike, if the mechanism is also clicking moving, maybe it just slipped and turn without moving the STVs.
Lastly, I'd also make sure that all the cables and connectors are attached without continuity issues.

I leave it to the more seniors to answer more.

Cheers.

[Idh]

I have the air filter out. When I manually push the secondaries closed, the shaft for the STPS rotates, but when I turn the ignition on, nothing moves.

Just to add more, with ignition on, I hear the fuel pump priming etc. With a torch into the airbox, I can see that the valves don't move during this priming process. Closing no3 by hand does move the STPS shaft.

Ah, there's your fault right there. You have no FI light and any codes?

The STVs should cycle whenever you turn the ignition on and the fuel pump is priming.
I am not sure how to diagnose that but I believe that is something that is not easy to trouble shoot.

I would recommend you check from the right hand side of the bike, if the mechanism is also clicking moving, maybe it just slipped and turn without moving the STVs.
Lastly, I'd also make sure that all the cables and connectors are attached without continuity issues.

I leave it to the more seniors to answer more.

Cheers.

Thank you. Will remove the throttle bodies I think. I can get a replacement from scrap dealers if need be. It's gone well beyond my knowledge  !

[Idh]

And yes, when I started there was FI error, two codes showing errors in both sensors , but when I adjusted the TPS, they cleared

[Will14]

First thing, I take it that you have reconnected the big grey plug on the left hand side, where you will have been taking the sensor readings, this is where the stepper motor get it's feed from (apologies if this is stating the obvious) with this disconnected the secondaries will not operate

Also there is a connector on the right hand side of the stepper motor bottom of throttle bodies, this is the feed to the motor, it is held in place with either a Philips or a JIS screw, worth removing, cleaning & checking for voltage before removing the throttle bodies which isn't the most technical job but is certainly a bit of an awkward job to do - if you go that route read the how to and get a couple of flat pieces of sheet metal cut to size to make removing the bodies easier   

[Eric GSX1400K3]

And yes, when I started there was FI error, two codes showing errors in both sensors , but when I adjusted the TPS, they cleared

codes will always clear as the ecu is very basic and no  capacity to store codes beyond 1 ignition cycle, so if you get a code and turn the bike off, the code will clear

[Eric GSX1400K3]

It does sound like the stva motor has failed, or at least the drive to the shaft is not connected.  There have been cases that the magnet oick up inside the stva breaks, so then the motor doesn't know where to turn to. Typical error codes would be C28 or C29

[Idh]

It does sound like the stva motor has failed, or at least the drive to the shaft is not connected.  There have been cases that the magnet oick up inside the stva breaks, so then the motor doesn't know where to turn to. Typical error codes would be C28 or C29

Thanks Eric.
Think I will open another topic on this, my initial hoses question has changed somewhat!