Running rough.

[Kiwifruit]

160km ride to visit dad today. Didn't miss a beat. Because l have always said the issue cheered up after opening the fuel cap until recently l'm hoping it was the ball bearing getting stuck over the breather hole in the fuel cap. Have to say l may over do the WD40 possibly  making things a bit gummy.
Anyway l very much enjoyed the ride, lots of bikes out today and lovely to have a sweet running bike. Fingers crossed thats been the issue.

[grog]

Fingers crossed Col.

[Kiwifruit]

Set off for Auckland on Wednesday arvo, rode 200+kms, just go to run down the motorway off ramp and hello the bike decides its going to sulk and run like crap. Get to a friends place. Bridge my new clutch switch, no change, bridge the side stand switch.....pop bang fart no change !!. Start the bike in the morning, seems to run not bad.
Got to a central Auckland Suzuki dealer and their very helpful workshop manager checks the fuel pump pressure,all good, plugs his scan tool in and find no faults. Said the throttle bodies could use balancing but that its not the cause of my problem.
So now I might try and contact a psychic and see if they have any ideas 

[gsxbarmy]

Set off for Auckland on Wednesday arvo, rode 200+kms, just go to run down the motorway off ramp and hello the bike decides its going to sulk and run like crap. Get to a friends place. Bridge my new clutch switch, no change, bridge the side stand switch.....pop bang fart no change !!. Start the bike in the morning, seems to run not bad.
Got to a central Auckland Suzuki dealer and their very helpful workshop manager checks the fuel pump pressure,all good, plugs his scan tool in and find no faults. Said the throttle bodies could use balancing but that its not the cause of my problem.
So now I might try and contact a psychic and see if they have any ideas 

Checked the pressure regulator clip Colin? https://gsx1400owners.org/forum/index.php?topic=1610.0

I'd also try adding an extra earth https://gsx1400owners.org/forum/index.php?topic=4828.0

[Kiwifruit]

Have a cable tie on something in there already Dave. This niggle started 5 years ago but only recently has it become more of an issue, before i seemed to be able to open the fuel cap and it would go away.
Have decided the problem is triggered when the throttle gets closed........ SOMETIMES 
Did 240kms going home and it didn't miss a beat.

[KiwiCol]

Coils power supply & earth? 

You might have to invest in a $10 switch & plug it into the dealer mode socket, then next time it plays up, flick the switch before you turn it off & see if there's a code come up while it's doing it.

https://gsx1400owners.org/forum/index.php?topic=744.0

[grog]

Col, has it ever flashed a code?

[Kiwifruit]

Never had F1 come up, never flashed a code and no codes stored either.
When its starts playing up l reckon its when l am slowing down, coasting and changing down gears, like to a stop or give way. Then it carries on doing it till l park it. Next morning l fire it up ride 250 kms home with 4 stops and it doesn't  miss a beat.
I've never said l'm going to sell it or even sworn at it. But it has become IT and no longer Her until it stops having sulky mood swings.

[Eric GSX1400K3]

You mentioned only when on a closed throttle, could be worn bushes in the throttle butterflies that are letting false air in.  Check for play in the shafts ?

Or, perhaps temperature related, as you mentioned coasting to a stop, im thinking faulty IAP sensor, mis reporting air pressure so then the ecu gets confused.

Without codes its a bit difficult

[Hooli]

There are figures in the workshop manual to test the temp & pressure sensors. I need to go through mine at some point to try & find why it's so thirsty & has black plugs too.

[Kiwifruit]

Thanks for your suggestions guys. Don't think its a wear issue as it runs fine then as fast as you can click your fingers it runs like shite and just as fast the rider has a sense of humour failure.
Think l will have to bite the bullet and put it on the dyno so it can be under load and see if it does it when you shut the throttle while hooked up to the diagnostics.
Its a bit of a bugger because the wife and l have been making plans for a trip to the South Island in the New year. So until l find its problem thats on hold.

[Eric GSX1400K3]

Agreed, but think how much better the trip will be with the bike properly sorted.

A motorcycle tour of the NZ south island is on my bucket list, ive done a 10dayer in a campervan, but two up on a bike would be a whole other experience.

[KiwiCol]

Been reading this whole thread again, I spotted you said the pairs are blocked off, just wondering if it has something to do with that?  Maybe rip it all out & check that sensor at the same time.  Be also a good opportunity to check all those small hoses for fit & cracks.

[Kiwifruit]

Agreed, but think how much better the trip will be with the bike properly sorted.

A motorcycle tour of the NZ south island is on my bucket list, ive done a 10dayer in a campervan, but two up on a bike would be a whole other experience.

Wife and I did a month on the bike in the South Island in 2015 coolest holiday ever   

[Kiwifruit]

Been reading this whole thread again, I spotted you said the pairs are blocked off, just wondering if it has something to do with that?  Maybe rip it all out & check that sensor at the same time.  Be also a good opportunity to check all those small hoses for fit & cracks.

Did ask some questions around having the pairs blanked off. Col the first time this issue happened was at Tekapo in 2015, thought i was low on gas, opened the fuel cap filled up, problem gone. Never gave it a thought that it was actually a problem. Pairs were still intact then too.