620 cutting out on idle when, only when engine is hot.

23-05-2013, 01:08 PM

Hi all,
Have been looking for an answer on the internet for a while now and have found very little.

Been happening for a while and even my local ducati garage didn't seem to be able to find the problem.

Problem:
Starts up and runs fine until the engine gets warm then lulls and often cuts out on tick over and particularly slow gear changes.

Simple solution is to keep a bit of throttle on a bit when I drop the clutch but not really a cure.

Cure???:
My best guess so far, from the internet and friends, is that the engine temperature sensor (pic,part32) to the ECU is giving a false reading and over fueling when the engine heats up?

Tried to get the sensor out on my lunch break and it doesnt seem to be the simple screw or pull i was hopeing, and i am not sure i would know how to test it even if i did get the bugger out?

Suggestions please:
....

23-05-2013, 01:23 PM

to get it out is a circlip on the inside. Not sure how you'll test it tought..

jerry · 23-05-2013, 02:03 PM

that fault is a classic of TPS out of alighnment , bike stalls at low revs or idle

gary tompkins · 23-05-2013, 09:11 PM

Temp sensor failure is fairly common on the early injected monsters

31-01-2014, 04:40 PM

Having still not got round to trying to fixing this, the problem developed even further last weekend and i am hoping it might help with further diagnosis with someone in the know...

Still idling like crap when hot however now the engine is reving up/sticking when i let off the throttle.
I checked all the mechanical throttle bit from the bars to the engine and they seem ok and moving freely.

Is this pointing toward TPS alignment issues? i am a bit weary of playing with that bit myself.

Really hoping to sort this soon...Ducati Alton have previously told me the only option is to re-flash the ECU and what seems to me like a stupid cost to just plug something into a computer.

Dirty · 31-01-2014, 04:50 PM

Doesn't bode well for your local dealer if they haven't got a danny and every one on here is saying temp sensor.

How much is a new one?

31-01-2014, 04:59 PM

Yeh not to impressed really they told me a while ago i had a miss fire because of low compression and charged me for a rear cylinder rebuild and it was just a corroded HT lead

Not sure if this is Temperature Sensor or Throttle Positioning Sensor but recent event make me think it may be the later...both about £60 i think.

Saint aka ML · 31-01-2014, 05:09 PM

Temp sensor would not make it stick open.

With new development I would say TPS needs resetting but also throttle bodies need balancing.

TPS reset is a 5 min job while balancing bit more but no point doing TPS reset before you balance throttle bodies.

One thing why would oil temp sensor impact how bike is running I was thinking if any such sensor would impact it would be the one behind head light air temp/pressure.

Check connection to that as my 620 (with 695 engine but still about the same) was very lazy, unresponsive and down on power with that sensor disconnected till engine warmed up. Then it was fine most of rev range just down below was sluggish.

Let us know what you find I have a spare air temp/pressure sensor left over form my engine swap so if you know that is the problem PM me.

Dirty · 31-01-2014, 05:47 PM

Quote:

Originally Posted by Saint aka ML

my 620 (with 695 engine but still about the same)

You still sticking to that line

slob · 31-01-2014, 07:37 PM

When where the shims last checked?

31-01-2014, 10:18 PM

My money would be on the air temp sensor up by the clocks. If it becomes disconnected or goes faulty the bike willl run rich.

Saint aka ML · 01-02-2014, 06:28 AM

Quote:

Originally Posted by Dirty

You still sticking to that line

Well it did not go pop yet, I now have indicators, it is faster then I can go in London so no need to pin it 100% of time, I have termis to fit well and belts.

Seems good bike

Dirty · 01-02-2014, 09:01 AM

Quote:

Originally Posted by Saint aka ML

Well it did not go pop yet, I now have indicators, it is faster then I can go in London so no need to pin it 100% of time, I have termis to fit well and belts.

Seems good bike

I don't doubt it's a good bike. Just not as interchangeable as was initially hoped

01-02-2014, 09:02 AM

Ok, the bike is back up north at the moment but i will have a look for the air temp sensor. I have taken the front fairing off and my old man had told me that was a bad idea letting all the water in.

@slob shims were done about 18 months ago.

@Saint aka ML i know the temp sensor in the front cylinder relays to the ECU and was thinking it might be giving a false reading therefore bad fueing when hot.

Ill check the sensor by the clocks and see how it goes. Might just be a trip to a different ducati garage though, i need to see whats over london way.

Saint aka ML · 01-02-2014, 10:21 AM

Quote:

Originally Posted by Dirty

I don't doubt it's a good bike. Just not as interchangeable as was initially hoped

Might as it is morning what do you mean not as interchangable?

23-05-2013, 02:03 PM	#3
jerry Old Git Join Date: May 2006 Location: Cricklade Bike: Multiple Monsters Posts: 2,831	that fault is a classic of TPS out of alighnment , bike stalls at low revs or idle __________________ MONSTERMAN

23-05-2013, 09:11 PM	#4
gary tompkins 1/2 man - 1/2 pogo-stick Join Date: Aug 2002 Location: Dartford, Kent Bike: M900ie Posts: 7,241	Temp sensor failure is fairly common on the early injected monsters __________________ GT Fully paid up member of the S.A.S. (Scottoiler Appreciation Society) 27,000 miles on original chain - and still going strong!

31-01-2014, 05:09 PM	#8
Saint aka ML Junior ah to be young Join Date: Nov 2007 Location: London Bike: Multiple Monsters Posts: 2,058	Temp sensor would not make it stick open. With new development I would say TPS needs resetting but also throttle bodies need balancing. TPS reset is a 5 min job while balancing bit more but no point doing TPS reset before you balance throttle bodies. One thing why would oil temp sensor impact how bike is running I was thinking if any such sensor would impact it would be the one behind head light air temp/pressure. Check connection to that as my 620 (with 695 engine but still about the same) was very lazy, unresponsive and down on power with that sensor disconnected till engine warmed up. Then it was fine most of rev range just down below was sluggish. Let us know what you find I have a spare air temp/pressure sensor left over form my engine swap so if you know that is the problem PM me. __________________ "I am Lucazade"

23-05-2013, 01:23 PM	#2
Pomp1 Guest Posts: n/a	to get it out is a circlip on the inside. Not sure how you'll test it tought..

31-01-2014, 04:40 PM	#5
matthuds Guest Posts: n/a	Having still not got round to trying to fixing this, the problem developed even further last weekend and i am hoping it might help with further diagnosis with someone in the know... Still idling like crap when hot however now the engine is reving up/sticking when i let off the throttle. I checked all the mechanical throttle bit from the bars to the engine and they seem ok and moving freely. Is this pointing toward TPS alignment issues? i am a bit weary of playing with that bit myself. Really hoping to sort this soon...Ducati Alton have previously told me the only option is to re-flash the ECU and what seems to me like a stupid cost to just plug something into a computer.

31-01-2014, 04:50 PM	#6
Dirty Bockloks Join Date: Jan 2012 Location: London Bike: No Bike Yet! Posts: 4,601	Doesn't bode well for your local dealer if they haven't got a danny and every one on here is saying temp sensor. How much is a new one?

31-01-2014, 04:59 PM	#7
matthuds Guest Posts: n/a	Yeh not to impressed really they told me a while ago i had a miss fire because of low compression and charged me for a rear cylinder rebuild and it was just a corroded HT lead Not sure if this is Temperature Sensor or Throttle Positioning Sensor but recent event make me think it may be the later...both about £60 i think.

31-01-2014, 07:37 PM	#10
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,714	When where the shims last checked?

31-01-2014, 10:18 PM	#11
Gilps Guest Posts: n/a	My money would be on the air temp sensor up by the clocks. If it becomes disconnected or goes faulty the bike willl run rich.

01-02-2014, 09:02 AM	#14
matthuds Guest Posts: n/a	Ok, the bike is back up north at the moment but i will have a look for the air temp sensor. I have taken the front fairing off and my old man had told me that was a bad idea letting all the water in. @slob shims were done about 18 months ago. @Saint aka ML i know the temp sensor in the front cylinder relays to the ECU and was thinking it might be giving a false reading therefore bad fueing when hot. Ill check the sensor by the clocks and see how it goes. Might just be a trip to a different ducati garage though, i need to see whats over london way.