Ducati 848 issue?
Discussion
Hey Guys!
So I just got back onto the bike scene after a lengthy hiatus. Having had a whole bunch of different bikes over my time (all 4 cylinder) I decided on something different.
To cut a long story short, my dad passed in January and his dream bike was a Ducati 848, so I got one in his memory.
Now, I absolutely love the bike. But iv noticed an issue. After about 20/30 minutes into a ride, it starts to bog out under steady revs. So you could have the throttle held to a point you’re cruising at say 30mph, and all of a sudden it bogs and loses all power, but then a little twist of the throttle kicks it back up again - so it’s as if you throttle off without throttling off - I hope people know what I’m trying to explain.
When I bought it, it had a full service and fresh MOT. It had new oil, new filters, new plugs and belts etc.
Is a 2011 with 8000 miles on the clock.
If this is a common issue or if anybody has experienced anything similar then please help me out.
So I just got back onto the bike scene after a lengthy hiatus. Having had a whole bunch of different bikes over my time (all 4 cylinder) I decided on something different.
To cut a long story short, my dad passed in January and his dream bike was a Ducati 848, so I got one in his memory.
Now, I absolutely love the bike. But iv noticed an issue. After about 20/30 minutes into a ride, it starts to bog out under steady revs. So you could have the throttle held to a point you’re cruising at say 30mph, and all of a sudden it bogs and loses all power, but then a little twist of the throttle kicks it back up again - so it’s as if you throttle off without throttling off - I hope people know what I’m trying to explain.
When I bought it, it had a full service and fresh MOT. It had new oil, new filters, new plugs and belts etc.
Is a 2011 with 8000 miles on the clock.
If this is a common issue or if anybody has experienced anything similar then please help me out.
Power drop-off or similar after a length of time riding has usually been a tank venting issue whenever I have had it - check the breather system on the tank; lift it and see if any pipes are kinked or blocked? Take your spare key; leave the bike running when the symptoms show up and release the cap - does anything change after that?
Pope said:
Power drop-off or similar after a length of time riding has usually been a tank venting issue whenever I have had it - check the breather system on the tank; lift it and see if any pipes are kinked or blocked? Take your spare key; leave the bike running when the symptoms show up and release the cap - does anything change after that?
I would think that a breather blockage would prevent the engine responding to increased throttle?If the pump can't get enough fuel into the injector circuit to maintain a steady 30, opening the throttle would cause it to die completely?
I would suspect one of the sensors.
Maybe worth getting a code reader?
Yeah it only does it under lower revs. There’s zero issue when you boot it, in fact it’s beautifully responsive.
At first I thought it might be doing it when the bikes getting warm, like a side effect of overheating but the temp never exceeds 75, and I was under the impression that’s not really that hot????
At first I thought it might be doing it when the bikes getting warm, like a side effect of overheating but the temp never exceeds 75, and I was under the impression that’s not really that hot????
SupermansImpala said:
Yeah it only does it under lower revs. There’s zero issue when you boot it, in fact it’s beautifully responsive.
At first I thought it might be doing it when the bikes getting warm, like a side effect of overheating but the temp never exceeds 75, and I was under the impression that’s not really that hot????
My Duc is a lot older and the EFI is probably quite different, but 75degC is pretty normal.At first I thought it might be doing it when the bikes getting warm, like a side effect of overheating but the temp never exceeds 75, and I was under the impression that’s not really that hot????
The 848 would be 'fly by wire' throttle rather than a cable throttle and a TPS potentiometer?
Is the 'damned computer' actually closing the throttle for some reason?
TBH I think you might do better on a Ducati specific forum or FB page.
rodericb said:
yeah they have a cable to the butterflies. After 30 minutes or so type of thing seems like fuel delivery - vacuum in tank or maybe the fuel pump.
Still hard to see how it's going to accelerate when the throttle opens, if the fuel supply can't keep up with a steady 30?But it should be easy to locate the breather hose somewhere at the bottom of the bike and check it's clear, probably a one-way valve to only let air intothe tank? There's probably another similar hose which is the drain from the tank filler surround. Worth checking that's clear too, won't affect running, but not good for it to be blocked.
A mate had an EFI bike where the pump would play up due to overheating, slow riding with a low fuel level.
You can do some basic checks on the pump, check it's delivering enough flow and pressure.
A pressure gauge and some hoses, a few quid off ebay.
Lack of flow is likely the fuel filter, but the flow needed to potter at 30 is not much!
On my bike, when you turn on the ignition before pressing the starter, you hear the fuel pressure regulator making a sort of squealing noise.
But with a modern bike, I'd pursue the code reading diagnostics if possible, it make take you straight to the problem.
One thing I have noticed is that my Ducati will often be a bit grumpy at low throttle settings after not being used for a few months. I put this down to fuel residue in the injectors. A few tanks of fuel through them seems to help. I think there's an improvement by using the extra-dear petrol with better additives in or chucking in some 'Millers' or other snake oil. Getting the injectors cleaned is not expensive and gives a good baseline, provided the rest of the system is also clean.
I'd also look at basic checks. Any air leaks into the throttle bodies? (tubes to sensor/pressure reg/...?)
Does the throttle move the butterflies as expected, no slack, nothing loose, do they look synchronised?
undo, clean, re-make all plugs and sockets?
Check the plugs for colour, buy new ones as a peace offering.
A lot of people seem to be forever adjusting throttle position sensors. The cynic in me thinks they only need adjusting because some muppet's 'adjusted' it before, but I could be wrong sometimes!
OutInTheShed said:
A lot of people seem to be forever adjusting throttle position sensors. The cynic in me thinks they only need adjusting because some muppet's 'adjusted' it before, but I could be wrong sometimes!
Guilty of this on the MV.However it turned out to be the drivers in the ECU, once they got warmed.
So a Code Reader might be a good place to start.
Post the same question here: https://www.ducatiforum.co.uk/forums/848-1098-1198...
Loads of knowledge in there ....
Loads of knowledge in there ....
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