1998 Ducati 900 with fuel injection

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Marcag

Joined
Oct 10, 2021
Messages
8
Location
Hillcrest, Kzn
Hi Guys,

I recently bought a second hand Cagiva Gran Canyon. It has a Ducati 900 ie motor. Recently the bike started sputtering and coughing and back firing at slow speeds with low revs. I found the problem to be a loose connection where the air intake meets the throttle body. Sorted that out and now the bike runs beautifully up to about 4500 rpm . When I try to open her up , she just cuts out until I bring down the revs and then she goes again. Any ideas what could be causing that?

i look forward to your replies.
 
Do a search in this site for map sensors. You'll find a few threads when more than 50% throttle caused the same issues.

Depending on what model sensors you have, they can be cheap on eBay. I'd say look at leaks in the lines but you'd have low speed issues if there was one. Might be a change and see job.
 
as far as i know the 16m ecu does not use a map sensor. its a pure ⍺-N ecu
i would start with the Fuel pump and filter assembly.
then IAW Diag to have a look at the sensor values and actor Tests

GuzziDiag / IAWDiag

<h1>GuzziDiag</h1> and tools for ECUs used by Moto Guzzi and others
www.von-der-salierburg.de www.von-der-salierburg.de
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ebay: obd usb
 
Last edited:
The pressure detector looks like a MAP sensor, but I can't see where it feeds from.
 
hm...it should have
AAT
AAP
both at the left front fairing on the ST2
TPS
and that's it ...?( of cause also engine temp and pickup...)

the difference between AAP and MAP is the little influence of the AAP.
i dont think that the AAP causes this problem.

i remember a common problem with the in fuel hoses and or pump/filter

"a loose connection where the air intake meets the throttle body. "
the Injectors? is that really fixed?
i would check this by depin the connectors and make sure the contact is 100% good.
 
I think mine has been damaged beyond repair, unless you can tell me otherwise.
The little white tuning screw inside the ECU has been turned so much that it broke off.
Let me know if I can get this one repaired or should I get a new or used one that works?
 
that screw/potentiometer is for CO adjustment.
its importance falls with RPMs. like the screw at a Carb.
if the CO Values are ok, if it idles fine. i would not care about that.

you also can read out its value with IAWdiag. (i think)
it is possible to open the 16M.
as you see it is not glued together inside.
that's imho the one big benefit of this ecu.
but i wouldn't do that until necessary.
 
what is the real CO value?

i found this in my notes:
"
Next to the chip socket there's a very small (1/4" square) trimmer potentiometer. This has the
same function as the external trimmer screw on P7 and P8 ECUs. The Trimmer on the 16M ECU
has a range of about 3/4 turn, or 270 degrees. When you hit the end stop, STOP !!! There is no roll-
over on these trimmers and they will break if you try to force them.
When you screw the adjuster clockwise the mixture is leaned. To set the default position, simply
set the trimmer in it's mid-rotation point. You can also use a voltmeter to set the 2.5 volt point.
"
so, from what i understand, you can check the poti from outside.
if you can adjust it...the poti is ok i would say.

I'm not sure if you can read this value with IAWdiag.
but you can perform a Injection test and so on.
I think it is worth a try.

edit. i had on my ST2 a very different CO at both Pipes even they are connected.
never checked this because it was running fine, but i had always the Injectors in suspicion.
 
Last edited:
Thanks Chris, I dont have a IAW diag. As I said the potentiometer is completely broken, so unable to adjust it.
I am not a mechanic, just trying to help myself. Ive taken the bike to Ducati Mechanics and they were not able (or unwilling) to help.
 
i posted the download link for IAWdiag before.
never mind
what you need is any car bike whatever workstation down the street with a CO tester at first.
if the CO value is out of range -> next step
 

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