Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > Sport Touring: ST4 / ST3 / ST2 > ST4s non start issue

[skidlids]

Phillipe it might just be the Ariel or the Ariel lead that picks up the transponder in the key, have you another one you can try or any one close by got one you could borrow

[bikermok]

I have a 2002 ST4S and I had big problem with it's temper that the engine can start sometimes but sometimes not. I have to walk away having a coffee and most of the time when I come back , the engine starts untill even this could not work after the battery is empty out , recharged, and empty out.
I tool the bike to Ducati dealer and test it on computer, nothing abnormal was found.
They changed the relay and the sensors for me. Now, it's temper is a lot better. It does not start sometimes but after a few teimes of trun the key on and off, it starts. Seems like the problem is still there but just not as bad as before.

[stafford]

Have a chat with Anthony at Avanti Race Parts as he has some insight into the ST4S's failings and ways of curing them.

[ratchet]

if worse when engine warm, may be crank sensor starting to break down,
hence ECU is not seeing engine turning over, and injecting fuel etc
problem is verifying if that is the culprit.