The colour of the plugs is a good guide as to whether or not the mixture's somewhere near right. Seeing how it seems to be heat related and it seems to be getting fuel and have a spark, I'd have a go at Nelly's suggestion and look at the TPS.
As it seems to be heat related get it warm so it wont run and then cool the TPS down, if you've got a compressor that'll do the trick
Without wishing to completely over load you..... BikeBoy.org - Ducati 4V Desmoquattro Non Linear TPS Baseline Adjustment (plus ST3) The mixture can be adjusted using the little pot in the ecu. If you do fiddle with it make sure you mark where it starts! But, I tend to go along with Nelly for now. TPS or even crank sensor.
ive tried what you said by getting the bike up to cut off temperature and keeping it cool with a powerful airline. butit still happens.......ive pulled a lot of hair out today lol
hi roch,first thing,start the bike when cold.then check if the exhaust pipes(the two of them) get hot?.if so,you can rule out coils/leads,the bike will run on one cylinder all beit lumpy as fuck.never seen the two sets fook up up at the same time with heat.as you said REV counter work as it should.so that looks OK.my guess is a fecked sensor breaking down under heaqt!...as in TPS as said by above.
I know its admitting defeat but it maybe easier just to get it plugged into a computer. However just thinking aloud here so someone pipe up if I'm talking crap: If the rev counter's working ok it's unlikely to be the crank sensor or a power supply fault. It seems to happen with heat so must be something that heats up with the engine. It'll backfire when you try to start it but won't run so there is fuel and a spark. keeping the TPS cool seems to rules that out, unlikely to be lambda sensors as they'll be up to temp in 30sec. Can't see that valve timing or compression problems will be affected by heat, it doesn't turn over really easily when hot does it? Based on the stuff above being true I think that leaves The air temp sensor, highly unlikely as its put in a place so it doesn't get any engine heat. Injectors, not sure on this as in my experience they either work or don't. The water temp sensor, I believe there are 2 one for the gauge that has no effect on engine running and another one that feeds signals to the ECU. The air pressure sensor, the one with the u shaped rubber pipe: And something phooey with the ECU.
well every one im stuck ,,,,,, im now going to start replacing sensors first being the crank sensor and so on got a funny feeling this is going to cost (ouch) but its gutted me literally. my vfr400nc30 is half way through a engine rebuild for cadwell on the 3rd august for classic bike track days, ive blew my tuned kr1s up at mallory park a couple of months ago at mallory park classic bike track days all ive got left is a rgv250 vj22. first of all i would like to thank every one for there help and if any one has had this problem i would love to here from you. if you go to www.northeast-custom.com and you will see what i do for a living and if any one needs help in my field of work im more than happy to help anyone. love the site :wink:
cheap option is to check every ignition related connector for poor contact with aid of wiring diagram :- Repair / Service manuals - Ducati
Hi Rochie, I've no experience of this software but it appears to be available and the link below says it's the right type, you'll need an OBD lead and fiat type adaptor as well as a laptop. But that's going to be £20 all in so it's got to be a start rather than buying sensors. http://ducatiforum.co.uk/f41/748-test-socket-8447/ Ducati Diagnostic Software - FREE HitCounter
