Miss fire gaps?

stenly · Mar 17, 2016

Has anyone else similar experience like I do have?
When I try to go hard on throttle Iam getting miss fire gaps time to time. Not sure if spark plugs are behind this or any other fault.
Bike has nearly 20k done.

Any clue? Thanks for comments

mentalist · Mar 17, 2016

when were plugs last replaced, service done??

Jokeshopbeard · Mar 17, 2016

Mid way through rev range or upon blipping?

BlueSwede · Mar 17, 2016

And it's not traction control cutting in, right?

stenly · Mar 17, 2016

mentalist said:
when were plugs last replaced, service done??

I have done 15k service at Ducati but as I checked the record, no plugs sparks has been changed. I guess there was no reason for it.

Is there anything else causing the problem which might has similar characteristics?

stenly · Mar 17, 2016

BlueSwede said:
And it's not traction control cutting in, right?

I just turned it off to see the difference and does not look like. DTC is activated mainly when you go very high with RPM or you r going into slide. Gaps are happening around 4-5k rpm

stenly · Mar 17, 2016

Jokeshopbeard said:
Mid way through rev range or upon blipping?

mid range only. 4 - 6t rpm. Any clue?

kuksul08 · Mar 17, 2016

I noticed this during part throttle at mid RPM. Fixed by the fuel module.

For misfires during full throttle but only mid RPM, could be a throttle actuator or TPS. The throttle bodies do not open fully until almost 7000RPM even if you have the throttle wide open, so they are slowly opening during this time. A faulty TPS or sensor could cause a hesitation here. A shop can read your TPS values and reset it.

stenly · Mar 17, 2016

kuksul08 said:
I noticed this during part throttle at mid RPM. Fixed by the fuel module.

For misfires during full throttle but only mid RPM, could be a throttle actuator or TPS. The throttle bodies do not open fully until almost 7000RPM even if you have the throttle wide open, so they are slowly opening during this time. A faulty TPS or sensor could cause a hesitation here. A shop can read your TPS values and reset it.

Dunno by throttle actuator because the faults are happening always within the rpm range but independently on throttle position :/. What you mean by fuel module?

Does TPS get reset every time you change a mode?

mentalist · Mar 18, 2016

Plugs should be replaced at 9000 miles, air filter at 18miles.
But note that poor fuelling and lumpy throttle around that rpm range is basically standard on these bikes, fixed mine with a rapidbike module.

kuksul08 · Mar 18, 2016

stenly said:
Dunno by throttle actuator because the faults are happening always within the rpm range but independently on throttle position :/. What you mean by fuel module?

Does TPS get reset every time you change a mode?

Fuel module = rapid bike.

Nope TPS must be reset with a tool.

astrocortex · Mar 18, 2016

stenly said:
I just turned it off to see the difference and does not look like. DTC is activated mainly when you go very high with RPM or you r going into slide. Gaps are happening around 4-5k rpm

If you stay at 4000-5000 somewhere does it keep doing it or just when you accelerate past it?

stenly · Mar 21, 2016

astrocortex said:
If you stay at 4000-5000 somewhere does it keep doing it or just when you accelerate past it?

hi man, its mainly when I am getting closer in this range (not fully open throttle) and time to time when i fire up from the bottom, something like

behaviour: +-++++++++
rmp fst up:123456789. . .

behaviour: ++--++++++
rmp slw up:123456789. . .

any clue except fuel module?

BlueSwede · Mar 23, 2016

Hmm... just read monocog's entry in another thread.. maybe try disconnecting your battery for 10 minutes... the ECU forgets its' history and maybe it will adjust fueling to smooth the weak spot you are experiencing. Dunno, but would not hurt anything...

mentalist · Mar 23, 2016

I'd be asking the service centre why they didn't replace the spark plugs??

Like I said earlier in this thread, they should be replaced every 9K miles

It could be a plug breaking down??

I've been a qualified mechanic for over 30years and offering my advice for you.

That's where I'd start if they haven't yet been replaced.

It Does sound like a plug breaking down under load.

monocog007 · Mar 23, 2016

mentalist said:
I'd be asking the service centre why they didn't replace the spark plugs??

Like I said earlier in this thread, they should be replaced every 9K miles

It could be a plug breaking down??

I've been a qualified mechanic for over 30years and offering my advice for you.

That's where I'd start if they haven't yet been replaced.

It Does sound like a plug breaking down under load.

To piggyback off this, I did notice the electrodes on my spark plugs were visually eroded a bit compared to the new replacements, even at 9k miles. If they didn't do the plugs as part of the service, then they should be replacing them now.

Miss fire gaps?

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