Bad running and dies

[Yami]

Hi guys,

A while ago starting my 14 up it was running bad. RPM goes a little how it want itself for a couple of secs.
Doesn´t respond so well on the throttle, hard to hold the RPM up and then it dies. No problem start
it up again but same bad running all the time. Absolutely no codes or errors on the display.
I´m stuck and would apreciate some advice. Bike has only 13000 km on the odo.

This is what I´ve done to fix it but nothing for the better.

Checked all fuses
Battery voltage is around 12.99
Checked fuelpump relay
Cleaned fuelpump, (was very clean)
Cleaned airfilter
Cleaned ON/OFF and Ignition switch
Opened tank cap in case of vaccum issues
Cleaned a lot of wiring connectors
Switched the whole throttle body taken from another working 14, no better
Checked inlet rubber and airbox rubber for cracks and leaks
Bike has still PAIR and all hoses is checked
New sparkplugs

What´s left to do?

Thanks

[seth]

Go to the bar and say hello and introduce yourself for a start .
Then check/change The plugs
Also check and if needed adjust the tps and stps ,
get the throttle bodies balanced .
Check the tick over is at 1100rpm.
Go through the loom checking a the connectors including the big plug under the left side panel and the ones in the headlight including the ignition ones .
Good luck

[Yami]

Go to the bar and say hello and introduce yourself for a start .

Hi Seth, thanks. I thought I did that a year ago.   

Go through the loom checking a the connectors including the big plug under the left side panel and the ones in the headlight including the ignition ones .
Good luck

Ok, done all your advice earlier except the connectors in the Headlight, it´s on my list now. 

[Eric GSX1400K3]

Check your in tank fuel pump, fron the sounds of it its not maintaining enough  pressure

[Yami]

Check your in tank fuel pump, fron the sounds of it its not maintaining enough  pressure

I have another bike I can take parts from. I did that with the throttle body and also the fuelpump.
This second fuelpump might gone broken too then you mean?

Just started it again and now the RPM goes up to around 4000 and stays there until I shut down.
This is so weird. 

[KiwiCol]

A bad TPS would / could give you the above issues.  (as would an air leak on the throttle bodies)   

Have a check of the TPS and see if it's working right.  Link below.   

https://gsx1400owners.org/forum/index.php?topic=263.0

[Yami]

A bad TPS would / could give you the above issues.  (as would an air leak on the throttle bodies)   

Have a check of the TPS and see if it's working right.  Link below.   

https://gsx1400owners.org/forum/index.php?topic=263.0

I took the whole throttle package from a working 14 bike. Hard to see there would be any leaks on that one.
Or that the TPS and STPS would be out of it then. Having the throttle bodies out I checked the inlet rubber and the airbox rubber
from cracks. They looked fine too.

But you are the second mentioning the TPS here now so I got to put it on my list. I´m out of ideas myself.
Been working with this issue the whole weekend so I got to take a break a couple of days before I get to it again.
Thanks for your advice

Questions, I saw on EBay someone sold fuelpump pressure regulators to our bikes. They had different psi though.
Which psi should I choose?
Just struck me now, Is there any difference between a fuelpump from a 2005 and a 2003? If there is, that might cause my issues.

[KiwiCol]

No, no different pump, they are the same all years.

[Eric GSX1400K3]

Sorry to throw another potential issue into the mix, if it runs but then goes to 4k rpm, it may well be the secondary throotle actuator playing up.

This is like a cold weather choke, its supposed to activate when bike is cold, sets the rpm to 2500 rpm or something like that  and  then gradually drops the revs as the  bike  warms up back to 1100rpm.

Apparently the STP sctuator is not serviceable, but if you have balanced  the throttle bodies and adjusted the TPS and STPS, it should work ok. Plus this displays the C28 error code when you bridge the ecu connector (FI error on the dash)

[KiwiCol]

Another thing to check is those narrow air hoses going to the TB's from the pairs system & the ?? sensor.  The one under the tank in the centre of the frame.  If they're off or leaking you'd get that & it would be the same on both sets of TB's as you're using the same hoses.

[KiwiCol]

Another (different) thought, what about the clutch switch? I wonder if it's stuck "in" and staying on 'start' mode for the ecu?

[Hooli]

Another thing to check is those narrow air hoses going to the TB's from the pairs system & the ?? sensor.  The one under the tank in the centre of the frame.  If they're off or leaking you'd get that & it would be the same on both sets of TB's as you're using the same hoses.

MAP sensor.

[KiwiCol]

Yeah, that one . . .   

[Yami]

Another (different) thought, what about the clutch switch? I wonder if it's stuck "in" and staying on 'start' mode for the ecu?

If it´s the little black thing fastened on the downside of the clutch master cylinder near the clutchgrip I have already taken that from the other 14.
But I will check it, can always hope it is that simple

I have just ordered a little thingy so I can check if there is any error codes.

And I found out that the pressure regulator operates with 43psi (3,0 bar) i Will order one of thoose to.

This is what I have on my new list then.
Check clutch switch
Check TPS
Check STPS
Change MAP sensor and hose
Clean/check the rest of the wiring connectors (headlight ones)

I will get back with a report how it goes later on.
Meanwhile, please post if you got some more tip.

Thanks

[Eric GSX1400K3]

Sounds like youre on top of it, im sure youll sort it out.  Just be aware you need the throttle bodies balanced before checking and setting the tps and stps sensors.  The morgan carbtune pro is ideal for balancing...