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Breva 1100 runs perfectly except it won't idle.

Thanks Jimmy

I've replaced the cam sensor on mine and adjusted the air gap to about 0.6mm (it was 0.9 and I thought it was supposed to be 0.6 to 0.7 so Johns response is interesting)

I still need to take it for a proper ride but now it starts on the button with no catching it on the throttle.

I did notice that (subjectively) the new sensor was more magnetic than the old one, so coupled with a larger air gap, I guess the old sensor could have been lying to the ECU by providing a weak or poorly timed trigger point?
 
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tris said:
Thanks Jimmy

I've replaced the cam sensor on mine and adjusted the air gap to about 0.6mm (it was 0.9 and I thought it was supposed to be 0.6 to 0.7 so Johns response is interesting)

I still need to take it for a proper ride but now it starts on the button with no catching it on the throttle.

I did notice that (subjectively) the new sensor was more magnetic than the old one, so coupled with a larger air gap, I guess the old sensor could have been lying to the ECU by providing a weak or poorly timed trigger point?
Click to expand...

Tris, I too thought it should be 0.6 to 0.7 but when I looked it up the spec was that other figure. Possibly just another error in the technical documentation. However it could explain why yours was at 0.9 as it was set there at the factory.
 
Update June 2020: I now think the cam position sensor was not the problem.

I used Diag to "Reset Auto learning parameters". The bike started to idle perfectly right away. However after a few hundred miles the problem returned! so I hooked up Diag and did it again. Instantly the bike idled perfectly!

I guess I can carry a small Windows computer and play this game periodically, but I'd sure like to know what the heck is going on. I hooked up a digital voltmeter to the oxygen sensor and saw some interesting results. As expected it jumps between 0.1 and 0.9 volts whenever I'm cruising, which indicates is oscillating about a perfect stoichiometric fuel ratio. However at idle it's always lean, even with both are screws closed. To me this suggests perhaps an air leak, or maybe for emissions purposes it's designed to run lean at idle.

My suspicion is that one of the sensors is off slightly, and the system compensates slowly eventually reaching a point where it doesn't idle.

PS I do not have any errors on the dashboard or the ECU.

if if anyone has any thoughts I will be interested.
 
I’m just a forum member here with ZERO authority but I can tell you emphatically.

Bastard Maps and GuzziDiag are strictly forbidden subjects here in these forums. You won’t get any help with it here.

They have and continue to be total douchebags towards Todd Eagan, the owner of all of this here.

Sorry, but you will have to get help from those guys.

For what it is worth, you are not the first person who’s motorcycle has been screwed up by those guys. I hear this same story frequently.

Good Luck.
 
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This Is the first time I've heard the term "bastard map" but I can guess what that means!

No, I never changed the map on this bike- I didn't dare to. Too much risk of "bricking" the ECU. We used to have that problem at a computer tape drive company I worked for. The only solution was to unsolder a very large and unwieldy CPU chip. Painful!

This is this is also the first time I've heard of the issue with Guzzi Diag and this forum. I've heard rumors that I can get the factory original software. Not sure what Search terms to use but I'll look for it.
 
JimmyZ1234 said:
This Is the first time I've heard the term "bastard map" but I can guess what that means!

No, I never changed the map on this bike- I didn't dare to. Too much risk of "bricking" the ECU. We used to have that problem at a computer tape drive company I worked for. The only solution was to unsolder a very large and unwieldy CPU chip. Painful!

This is this is also the first time I've heard
Click to expand...

Please don’t shoot the messenger! That post is a copy and paste from another forum. Todd modified it.

From what I was reading, it appears to me that you are not solid on how the idle setup is supposed to be done.

This will help you fully understand...

https://www.guzzitech.com/forums/threads/syncing-throttle-bodies-stelvio-8v.9082/page-2#post-151363

Also, if you have not shot carb cleaner directly into the stepper motor like John Zibell said, then you are most likely gummed up. It’s about the tiny orifice being completely clean...
 
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