Norge, here we go again

[Bison]

Hello folks.
2007 Norge.
Well, I managed about 5000 miles before another, problem.
Starts off the button every time, runs great and puts like a train, until you close the throttle and open it again, then it dies, for maybe 5 seconds or so, and then picks up again, until the next time you close the throttle, then same again. If you ride on a light throttle, or close the throttle slowly, it doesn't happen so much, but it's getting progressively worse, and much worse if you ride quickly.
No fault codes. It will sometimes die when stationary, EG at traffic lights, sometimes not
 It feels like fuel starvation, but at idle?, no air lock, injectors clean, pump working and building pressure then stops when at pressure. no water in fuel, no gurgling in the tank indicating a burst pipe or filter. Steel canister filter fitted, not old. No misfire when it's running, pulls very well, fuel pump connector cleaned
Battery at 12.9v, under load 12.7v, charging 13.8v to 14.3v when engine running. All earths (grounds) clean and tight, all fuses good and cleaned, all relays cleaned and swapped around with one another. TPS reset, but it was within spec anyway, all Guzzi Diag readings are spot on. When it dies the dashboard still operates, no warning lights, no red triangle. speedo works until you pull to a stop. I can't remember if the rev counter works when it dies,  but I think it does, which indicates the ignition/spark is working, as I assume it works of the ignition. It doesn't go onto one cylinder, both cylinders cut out. Plugs re good, as are leads, caps etc
I'll check the air filter over the weekend.
Something similar has happened before, but then the dash and everything would die randomly, no ignition, no lights nothing, it doesn't do that this time. I found a cold solder joint overheating on the strip fuses the previous owner had installed, it's not that fault this time.
Any ideas folks?
Alan.
PS, reading my post over I think these are classic water in fuel symptoms. I removed an injector and cycled the pump to drain fuel, but not all of the fuel that was in the tank. I'll do that over the weekend and also remove and clean out  or replace the filter. I'll let you know.

[Huzo]

Get on Guzzidiag and check that the TPS is tracking correctly with throttle opening. I can’t remember which function it is, but there is a trace that you can bring up that draws a graph that checks this function.
Check that the TPS is not loose in its housing.
Check the throttle linkage arm that connects the two throttle quadrants is secure.
When it “dies”, do you mean loses some power or cuts out like you’ve turned the ignition off ?
No stored or currents codes you say ? Is that on the dashboard or Guzzidiag ?

You say it pulls like a train after start, yet later on you suggest the problem is worse on high throttle, can you elaborate there ? It seems significant that closing throttle then reopening exacerbates the issue. It’s sounding like the TPS command to the ECU is awry.

It can’t be starvation or poor tank venting or it would not pull hard, it’s not electrical because the mechanical closing and reopening of the throttle is seperate from that. Does it display this symptom in neutral ?
Are the throttle plates tight on the pivot spindles ? (I guess so because it’s happening on both)🫢

[Bison]

Hi Huzo,
On GuzziDaig the TPS reading moves and returns to it's original setting, I'll look for the graph.
The TPS is fastened securely
Yep, throttle link arm good, I had problems with that and repaired it.
It cuts out like the ignition is turned off, but the dash has power and no warning lights of any sort.
No fault codes on GuzziDiag, on the dash there are some X's in the right hand column which will not delete/reset, the left column has clear circles, no faults.
Sorry for not being clearer. When I open the throttle and go quickly, it goes great, it accelerates cleanly and powerfully, when I  close the throttle, say for a roundabout, it dies after a few meters, then eventually picks up again  regardless of where the throttle is, if I hold the throttle slightly open, clutch engaged,  it will pick up and accelerate normally after about 10m. If I use small smooth throttle openings the problem is much less pronounced.  It will  accelerate cleanly and powerfully with no misfire up to any speed, but if I close the throttle , it will cut out, but not always immediately, if I open or close the throttle to a cruising speed, slowly, it runs beautifully, all the time, for as long as I want,  if I close the throttle slowly it doesn't cut out, every time, but it will probably cut out when I stop say at traffic lights.
It revs in neutral with a very slight hesitation if the throttle is really snapped open very quickly. A couple of times at traffic lights I have come to a stop and immediately after pulling in the clutch it will die, but not always. after it cuts out it starts immediately, no misfire, no excessive cranking
When I accelerate and change gear it doesn't miss a beat, when I change down it dies, ie when I keep the throttle closed for a longer period.
Imagine if you were riding up to a roundabout, or slowing down for a corner, close the throttle then after a second or two  flip the kill switch, then after 10m or so, flip the kill switch on again, and away it goes, that's what it's like.
It does seem to be getting worse, which gives me more chance to locate the problem

[Huzo]

 :undecided:Bloody hell…!

[PJPR01]

Sounds mechanical in nature...at first glance, will have to read it a few more times.

Have you checked the 2 throttle cables, pull and return and where the nuts are screwed out to on the rubber boots right behind the throttle on the handlebars.  Has that snagged or come loose?