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Discussion Starter · #1 ·
Hi. I recently purchased this gsxr 600 k3 with the FI light on and a C28 error code showing when in dealermode. When i opened up to see whats under the tank i found theres a problem with the STVA, which there should be according to the code. Theres also a beeping/squeeking sound. Ive been googling the problem, but without finding anything thats fully applicable to my problem.

I filmed the STV while starting up:

I grately appreciate any thoughts shared on the matter.
 

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I think this one or run by pulley
If so check it's tension, put into dealer and check the mark

Sent from my Redmi Note 9 Pro using Tapatalk
 

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Discussion Starter · #3 ·
I think this one or run by pulley
If so check it's tension, put into dealer and check the mark

Sent from my Redmi Note 9 Pro using Tapatalk
Thanks for ur reply, but i dont understand what u mean. Could you try to reformulate what you're saying please? :)
 

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Dreaming of buttsecks for years...
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The squealing you hear is the fuel pump. The service manual has testing procedures for the STVA. C28 tells you what system has the problem, not the specific component in the system. Based on the way it's moving, I think the secondary throttle position sensor is suspect. Sometimes they short internally and fool the ECM into thinking the STVA is moving erratically when in fact it's just bad data. The ECM just doesn't know the difference.

However, that STVA is a one off and was only ever used on the 2003 600. It's a bit of a goofy design compared to all of the other STVA designs.
 

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Discussion Starter · #5 ·
The squealing you hear is the fuel pump. The service manual has testing procedures for the STVA. C28 tells you what system has the problem, not the specific component in the system. Based on the way it's moving, I think the secondary throttle position sensor is suspect. Sometimes they short internally and fool the ECM into thinking the STVA is moving erratically when in fact it's just bad data. The ECM just doesn't know the difference.

However, that STVA is a one off and was only ever used on the 2003 600. It's a bit of a goofy design compared to all of the other STVA designs.
Hey! thanks for the reply. I see. Any suggestions for what i should do with the problem? any point in buying a new STVA for example? what about removing the valves?
 

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Dreaming of buttsecks for years...
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I dunno, may pull out the manual and do the diagnostic procedures?
 

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Hey! thanks for the reply. I see. Any suggestions for what i should do with the problem? any point in buying a new STVA for example? what about removing the valves?
Yes remove the secondary butterflies. If I remember correctly they font sell parts separately. Choice is to get new or used throttle body. Removing the secondary butterflies can make a few more HP top end but may produce a small flat spot on the bottom end. If you have a tuner I suggest cleaning the fuel map up after removal.
 
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