V4S Cutting In & Out

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Todd H

Todd H

Joined
Aug 27, 2014
Messages
122
Location
Oviedo/Orlando, FL
If you have accidentally pushed the shifter enough to "pause" the engine for a second, then you know what I am attempting to describe....

Recently my V4S has begun to experience fits of the engine surging or cutting in/out hard. It seems to happen anytime I want to accelerate after steady-state throttle (even if steady-state is only a handful of seconds).

Example... you get stuck behind a car for a few turns on a twisty section. You make the pass and start to attack the corners, but the bike cuts out and restarts hard (again imagine you tapping the quick shifter). It will do this surge 2-10 time, stop for a few seconds, then do it again, for up to a minute before it settles down for a couple minutes, then starts this dance again.

It has done it on a full tank, and an a near empty tank. It has done it at 1200 feet altitude and 3300 feet. It has done it with 2 or 3 bars of engine temperature - either stuck in traffic or when riding on an open road. There doesn't seem to be a rhyme or reason, other than riding aggressively, getting choked down, and going again seems to always cause it.

Anybody experience anything similar?
 
I've had almost the exact same issue although mine was more sporadic and unpredictable. Mine ended up apparently being a faulty quick shifter which Ducati replaced on warranty. There are a few threads around about this as several people seem to have had similar behavior. Please post what you find out when you get up the bottom of it. I'm still not entirely convinced it was my quick shifter although I haven't had it happen since.

At least yours is easy to reproduce. In my case they just had to go on symptoms I described.

Sent from my SM-G930W8 using Tapatalk
 
The quick shifter is bad, take it to the dealer and they'll change it out under warranty.

Although my new quick shifter from the dealer does the same problem after its exposed to heat for a long time. I was doing an endurance race, and after riding for 30 minutes on the track getting hot, the quick shifter started to fail again. When doing 20 minute sessions, I didn't have the same cutting out problems.
 
I have the '19 corse and I also have this issue. I disabled the QS and it made no difference. Had it recently serviced 1K where tank recall and fuelling update was carried out. Still waiting on feedback from Ducati

If anything comes to light, I'll be sure to post it up as well

Cheers
 
jarelj said:
Also check your side stand sensor.
Click to expand...
They actually makes a lot more sense given how mine behaves when it does it. Also worth noting it's happened when I've had DQS disabled as well. Usually under hard acceleration. It's the worst time too. Have had some nut crushing slams down from power wheelies.

Anything in specific to check for?

Sent from my SM-G930W8 using Tapatalk
 
Sadly the dealer was unable to find any issues on the bike. The Ducati rep suggested recalibrating the tires, so this was done....

However, the problem previously showed up after a long and spirited ride thru the mountains. My fear is that another long day of aggressive riding with cause the problem to come back and will once again ruin another mountain trip.
 
I had my bike at the dealer for recall work. They could not find anything regarding cutoffs.

They mentioned that sometimes when touching the shifter lever while accelerating may cause the cutting in/out. I will pay more attention to my foot positions, but doubt this is the real cause.
 
So... I went for a ride to test the theory that somehow foot position can induce shutting off behaviour. To my surprise I was able to cause it at will.
I noticed that I tend to slightly preload the shifter in anticipation of the next shift. When doing this the bike would shut off and restart.

I'm now convinced that at least for some of the cases this is rider induced.
 
roadczar said:
So... I went for a ride to test the theory that somehow foot position can induce shutting off behaviour. To my surprise I was able to cause it at will.
I noticed that I tend to slightly preload the shifter in anticipation of the next shift. When doing this the bike would shut off and restart.

I'm now convinced that at least for some of the cases this is rider induced.
Click to expand...

Do you think Ducati should do something about it though. I mean that's like me saying well I'm getting ready to shift and preload my clutch. I drive a manual and my car shuts off. I mean come on there needs to be a fix. That's a hazard waiting to happen. For this amount of money of this pretty but pain in the butt bike.
Cuz I'm having the same issue, just my bike never did it before this most recent update.
 
I was not preloading the shift lever that much, certainly not enough to cause any abnormal transmission wear. I think the ignition cutout mechanism / sensor does not have much of a tolerance. On the flip side, I suppose, adding more tolerance could result in sloppier clutchless shifting.
 
therealgeo said:
Do you think Ducati should do something about it though. I mean that's like me saying well I'm getting ready to shift and preload my clutch. I drive a manual and my car shuts off. I mean come on there needs to be a fix. That's a hazard waiting to happen. For this amount of money of this pretty but pain in the butt bike.
Cuz I'm having the same issue, just my bike never did it before this most recent update.
Click to expand...

He's preloading the shift lever which, I assume, is causing the DQS sensor to cut the ignition thinking he is shifting.
 
I have noticed this problem as well. It has occurred when I am going relatively slow 40-50 mph. It lasts about 20-30 seconds and then stops.

I wonder if this is related to an OEM engine mapping issue. I would be curious to hear from guys that had the problem and then did an engine flash and exhaust change out to see if the problem went away.
 
I really doubt it is a foot positioning problem in my case. I thought of this potentially being the issue when it first happened and was conscientious of my foot placement. It also happened in a multitude of corners when I ride on the balls of my feet.
 
Thank you. Finally there are people in this group who has experienced what I am experiencing as of right now. I have a 2018 v4s with 2200 miles on it. As I ride the bike in the canyons , only when the bike is hot , 3rd gear down shift to second setting up for cornering , the bike surges as I am in corner entry. It is the scariest feeling In the world. The throttle is completely closed allowing EBC on level 3 slow recovery engine down and the engine is revving on its own , upsetting the bike. Took it to the dealership and they can’t replicate the problem.

I specifically told them to ride the bike hard and then test it when it’s extremely hot. My old 1299s use to surges on its own until I re-flashed it by Bren tuning. Never had an issue then. Since I have a 3 year warranty , I don’t want to mess with the ecu until then. This definitely should NOT a happen as this is a huge safety issue.
 
Sounds like the auto blipper is kicking in. Faulty quick shifter would cut sometimes and blip sometimes I would think? That’s the sensor I would look to.
 

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