This one boggles my mind, hopefully there is someone out there to shine some light on it.
I have a 2001 748 with a 996 motor in it. The previous owner did the change and also upgraded the chip. It has done roughly 15,000km with this setup.
Prelude: A few month ago I went for a ride and had 3 hours without any problems. Then the motor started spluttering and stalling. Got it going again and barely reached my destination. After sitting for a few days it didn’t fire up at all. Side note: before the ride I installed a new coolant tank.
Now a few month later while waiting for a bolt from Ducati (unrelated) the symptoms now are:
Ignition on, both relays under seat switch on, right one turns off after a second, left stays on (I imagine this is the one for the fuel pump?). Bike starts and runs, both relays stay on.
Ignition off and after ten seconds the left relay switches off. After that it does not switch on again with the ignition on, therefore no sound from the fuel pump.
Unplugging one or both relays and put back in the same place, no relay action, no pump, no start.
Unplugging and swapping over relays, all is good again, bike fires up and runs.
Until I switch off for more than 10 seconds again, after that – nothing. I can repeat this as often as I want with the same result. Same with new relays. Also, disconnecting the battery and reconnecting seems to work as well and the bike runs again.
I did all the recommended checks mentioned in forums: fuses, connection cleaning, earth checks, connectivity of wires, checked the fuel pump in and out of the tank, I even replaced the Eprom chip with one that came with the bike (identical to the one installed, got nothing so don’t know if this is a good one), but no luck. It just doesn’t make any sense to me.
I remember “anyoldiron” posted in Ducati MS a similar problem 10 month ago after putting in a 916 engine and fixed it with an upgraded Eprom. However my setup ran fine for 15,000km but I have no other logical explanation then a failed chip. Can the Eprom get corrupted? Is the fact that I got an identical chip with the bike an indication that it had failed previously and points to a problem corrupting the Eprom after a while? Possible. If this is the case, can the Eprom be “re-set”? I also have two other chips which I assume are for the old 748 engine but I haven't tried them as I don't know much about them.
This problem is way above my pay grade so I’m grateful for any input.
PS: If I’m in need for a new Eprom chip, where do I get it in Australia? Also I could not find a replacement waterproof relay as the ones installed in the local auto shops, only normal ones but forums talks about easy to find and very cheap??
Thanks in advance for your help and I’m happy to provide any missing details if needed.