Im looking for any kinda help/info i can get. When I turn my key to the on position my bike makes a loud noise for 3-4 seconds. After it stops the bike starts good. Not sure what it is but it doesnt sound healthy. My bike is a 2003 GSXR1000.

Hillsy

starter?:dunno

Noisy fuel pump ?

Probably the valve in your header

the noise goes away after 3-4 seconds. It doesnt make the sound while im riding. It would do it all the time if it was the valve wouldnt it?

Probably needs to be lubed. Mine did the same thing until I unhooked it

Sorry this might sound stupid but what needs to be lubed? and what or how did you unhook it? cause the noise is driving me crazy

Wait sorry i did some research and now i think i know what you mean. If I unhook the wires at the EXCA in the exhaust will that stop the EXCVA gears from grinding? The person before me put a Yoshi half pipe on. Do i need to unhook the power to the EXCVA?

I was betting on the fuel pump but perhaps not. As best I know, the gears in the EXCVA actuator are nylon and are relatively easily damaged. The ECM cycles the valve during power-on so that would be a time for the gears to grind. However the grinding noise should be present during normal operation unless you can't hear it over the exhaust. A simple test would be to disconnect the actuator connectors and see if the noise goes away. This will cause a C46 error to appear so you'll need to reconnect or remove/disable it.

Is the EXCVA a must?

do you use your red kill switch?? if not, try turning the switch off and see if it makes the same noise. if it does not then turn the switch to run and see if it makes the noise, if it makes the noise when you turn on the kill switch the noise you are hearing is the fuel pump.

I have the same noise at power-up on my 03. The sound I am hearing is comin from a small box on the right side of the throttle bodies. Everything runs fine but wanna make sure it's not something serious. Hillsy, is the sound during "start-up" or "power-up"? You said it happens when you turn the key... Is ur kill switch in the on position when you turn the key? My sound seems to be the fuel pump but not sure.

if its like a racheting noise it could be a misadjusted secondary TPS, check out bugmans website

I have a feeling he is talking about the fuel pump.Does it make this noise when engine is not running like 1/4mile said toggle on and off red switch.If it does it when bike is running you got bigger problems

do you use your red kill switch?? if not, try turning the switch off and see if it makes the same noise. if it does not then turn the switch to run and see if it makes the noise, if it makes the noise when you turn on the kill switch the noise you are hearing is the fuel pump.

+1 - only way to narrow it down.

hillsy, is it not a whining noise more then anything?

I would put money on it being the set valve. Mine did the same thing until I unhooked it. It is not needed. Is only there to lower the exhaust tone

Sorry about not replying back in good time but I have looked into it a bit more. I lifted the gas tank and the grinding noise is coming from the Secondary Throttle Positioning Actuator. There is a vibration when I put my finger against it. Could that be a un calibrated TPS? Or is my STPA screwed? Could the STPS need to be calibrated as well?

Read this (http://www.motorcycle-journal.com/forum/gixxer-mixer/25721-secondary-throttle-valve-actuator-defect.html), this (http://www.gixxer.com/forums/showthread.php?t=144191), and this (http://www.gixxer.com/forums/showthread.php?t=202510).

when i check continuity to ground on the 4 pins going to the STPA two of the pins dont have ground? is that correct?

The manual isn't very well written in the C28 section but, as I read it, none of the four leads to the actuator should have continuity to ground. I hope that you're testing the actuator when disconnected from the wiring harness. The manual also talks about checking for an open or short circuit in the leads to the ECM but, though not specifically stated, I'm fairly sure that those tests should be performed with the wiring harness disconnected from the ECM.

It is normal, It is the fuel pump priming fuel... With the key on and the engine stop switch off it won't do it, when you flip it on, the pump primes fuel... Everyones bike here should do it if it's fuel injected.... Almost all fuel injected bikes do it...