Setting the TPS

[Tonythetiger]

Could anyone point me in the direction of the "HOW TO" on setting the TPS as I'm having a few issues with the way the bike is running at the minute, she seems a little lean  and yesterday when I gave her full throttle she bogged out. She has plenty of power and up to about 5500/6000rpm then she seemed to die for a second at which point I dropped throttle and then straight back on and off she went, I've also been thinking about the fuel filters and cleaning the tank out but I've never done it on a FI bike so a little nervous even though it's pretty straight forward. Any help would be appreciated from all you knowledgeable chaps.
                                 Tony.

[seth]

https://gsx1400owners.org/forum/index.php?topic=263.msg103626#msg103626

Just use the search feature here a big thread but worth a read through it all.
Once you get both the tops and the stps set it'll run much smoother.
It's much easier if you have 2 people.

[Globalrider]

Tea Bag! Common issue - It happened to me!

[Eric GSX1400K3]

I'm having the same issue, at 5000rpm or thereabouts she stutters and hesitates, then picks up again.

Throttle bodies balanced and so on, all within spec but it still does it. So my theory is the TPS itself is shot, the little metallic track that determines the voltage in the sensor must be corroded or pitted. 

The sensor is as far as I know, the original one, so 21years old.

The STPS was the same and caused low speed snatchiness and increased fuel consumption. Replacing that fixed it. Now I need to replace the tps as well.

I believe Hooli is chasing a similar issue.

Best of luck, it's pretty straight forward to reset the tps and balance the pots.

[Dwain Dibley]

If you want to see how I did my tank, look here

Scroll up for the pump part.

I was trepidatious but once I got it to bits it was a piece of cake and yes the tea bag was well clogged up. I cleaned it with brake cleaner.

D.D.

[Hooli]

I'd guess that's fuel filters rather than TPS if I'm honest.

If it always happens at the same RPM it's pointing to a time the engine's demands for fuel/air isn't being met properly. TPS faults show up as at an issue at a particular throttle opening. I can produce rough running anytime I want by opening the throttle to the right point, which is where my TPS is going dodgy again.

[Tonythetiger]

Thanks boys, as usual you have come through and is the best reason to be a member of this site. Tony.

[Eric GSX1400K3]

I'd guess that's fuel filters rather than TPS if I'm honest.

If it always happens at the same RPM it's pointing to a time the engine's demands for fuel/air isn't being met properly. TPS faults show up as at an issue at a particular throttle opening. I can produce rough running anytime I want by opening the throttle to the right point, which is where my TPS is going dodgy again.

possibly, but hp filter bypass done, bypass filter and lp in line filter also clean. Teabag recently replaced and (sadly) not enough riding time this summer for it to get clogged, tank internals are clean as well, so all I can reason is the TPS....happy to be corrected, but that's what I'm checking out next, will take it off and measure voltage through it's range of motion, if any gaps in the reading, then I'm pretty sure the sensor track is to blame.

[Hooli]

I've never had one fail & actually show a fault when I test it like that, I agree it should show a fault but they never seem too.

I did a write up somewhere from info I found on a US GSXR forum but from memory also check the resistance between power & earth for the full range of movement. Obviously that shouldn't change, but I've seen them short internally to the sensor wire so it does.

FYI I've just ordered two TPS for my K2 from japan.webike.net for £105 delivered, that's as cheap as one delivered from a UK dealer. I figured a spare on the shelf is handy, it can sit next to my spare high pressure filter & MAP sensor etc etc

[Andre]

IMO there are only 2 viable tests to check for this type of fault:

1. Hook up a digital osciloscope and watch the waveform as you rotate the potentiometer (TPS).

2. Replace the TPS. Buy new or borrow a known faultless one.

[Eric GSX1400K3]

I've never had one fail & actually show a fault when I test it like that, I agree it should show a fault but they never seem too.

I did a write up somewhere from info I found on a US GSXR forum but from memory also check the resistance between power & earth for the full range of movement. Obviously that shouldn't change, but I've seen them short internally to the sensor wire so it does.

FYI I've just ordered two TPS for my K2 from japan.webike.net for £105 delivered, that's as cheap as one delivered from a UK dealer. I figured a spare on the shelf is handy, it can sit next to my spare high pressure filter & MAP sensor etc etc

I remember the write up mate, it's what I used to check and confirm that my stps was done for. Since then, no more C28 errors.

[Tonythetiger]

I've just read the TPS readings at the grey plug and are as follows.
1.068 F/C
2.400 F/O
I've noticed in a lot of the threads that the F/O reading is similar when read at the grey plug and I don't feel like it's the TPS causing the issues now so onto the next thing which is tank off cleaned out and have a go at the fuel filters, What's the H.P bypass all about? does it really improve the running or just prevent future issues?
I'm all for making my baby run the best she can and would consider most things if they are worth doing so opinions welcome. Tony

[grog]

Tony, IMO fuel filters being clean is absolute first thing.Nothing else matters until you know for sure that flow/ pressure is perfect.

[Eric GSX1400K3]

The HP filter has a limited life as we all know, OEM fuel pumps are dear, and you can't buy the hp filter separately. Hooli did find a cheaper aftermarket pump and filter  these seem OK,so may be worth a crack if you get one. Have a search on here for the bypass mod, I think it's worthwhile and it's easy to do, you end up with a cleanable remote filter. Adding an inline lp filter also helps. Stops fuelling issues related to clogged hp filters where the bike hesitates from lack of fuel pressure and flow to the fuel rail.

[grog]

You can buy hp filter separate genuine, just 700 odd dollars, whole assembly is $1900.No wonder we search for alternatives.Think the Busa copy Hooli found less than 100.Way to go Tony unless external.If id known about cheapie when i did external, not sure which id choose. Either way, free flowing fuel makes them run like they should.