Occasional hunting idle - MVAgusta.net
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post #1 of 14 (permalink) Old 03-16-2018, 08:10 AM Thread Starter
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Occasional hunting idle

Hi Gang,


I have finally had the chance to get my brutale out the last few weeks for short rides. I have noticed on several occasions that my idle hunts for a few moments and then stops at idle.


My idle is around 1400 and most of the time it's steady but I noticed yesterday it would occasionally hunt from 1400-1700 up and down and then settle down after a few moments. Almost like I was slightly reving the bike and then letting go.


The temps are very cold here still...low 40's and I have no idea how old the gas is as I just bought the bike a few months ago and the dealer had the tank full when I bought it.


Otherwise it runs incredible. Cant believe the power and smoothness of the bike!


Thoughts?

2006 MV Agusta 910S
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post #2 of 14 (permalink) Old 03-16-2018, 08:24 AM
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First can we start with where "here" is. This is a big planet.

The usual suspects are poorly synched throttle bodies, air leaks on the intake tract, and the poor ECU tune that each MV has stock.

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post #3 of 14 (permalink) Old 03-16-2018, 08:43 AM Thread Starter
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I'm almost certain the bike has a custom tune, since it has exhaust/midpipe and cat delete. Runs like a wild bull otherwise...bike only has 3800 miles

I've done the throttle body synch on my other bikes...i'll do a search and see how to do it on here.

Thanks!

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post #4 of 14 (permalink) Old 03-16-2018, 09:29 AM
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You are welcome.

If you could add your location to your profile, it would help us in the future. I'm originally from Indiana...a great state to be FROM.

As for the custom tune, there are very few people doing that. Your ECU is probably a Magneti Marelli 5SM. THere is a guy in your neighboring state that worked with me and guy here to break into and develop tuning for the MV Agusta bikes. That might be a resource for you if you want to check your state of tune on a dyno.

Chuck

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post #5 of 14 (permalink) Old 03-16-2018, 09:48 AM
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Could just be the low air temp and the engine not reaching full operating temps. The ECU is changing fuel mapping to compensate.
Could also be old fuel.

Before you do anything, get fresh gas in the tank and take a long ride.

I used to be fast....now I just dream about it.
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post #6 of 14 (permalink) Old 03-16-2018, 10:58 AM
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Hi i take it this is a 910s brutale 2006 if so you will have a 16m ecu with eprom
you will need to check your Co reading should run at 3-4% +or- 0.5% so 3.5%
you will find were your bike likes to sit my 910s sits at 3.2% and idles sweet these bike are very delicate
any adjustment affects the other ie you said you adjusted the throttle bodies just doing that will upset something else
throttle body sic idle, and co are all linked, you have to get them all right, setting co has to be done when the fan is running
as well as throttle bodies, idle is set at around 1200 rpm higher rather than lower .
i have just put my bike back into service after a 6 month lay off put ecu and spu back on headlight on, reconnected battery,
dash back on, and put fuel back in used the fast idle lever on handlebar for start up after a few turns she lit up and started
let her warm up and she was fine but i noticed that my idle was about 1400rpm never done that before so turned down idle screw
and re adjusted co and it was sweet. so as i said any thing can happen with theses bikes thay are very pernickety and tempermentel
i also live in a cold and wet climate during winter
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post #7 of 14 (permalink) Old 03-22-2018, 07:49 AM Thread Starter
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can anyone post a link to the CO adjustment? what do I need for tools? is this done via the computer and having an appropriate cable?

2006 MV Agusta 910S
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post #8 of 14 (permalink) Old 03-22-2018, 08:52 AM
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is the air filter clean
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post #9 of 14 (permalink) Old 03-22-2018, 09:01 AM Thread Starter
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Not sure. I will check.

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post #10 of 14 (permalink) Old 03-23-2018, 09:11 AM
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Quote:
Originally Posted by ArabianOak View Post
can anyone post a link to the CO adjustment?
Inside ECU (Magneti Marelli IAW 16m) there is a potentiometer that adjust injectors timing - affect CO value. Don't turn it 360 - you'll damage it!!

Quote:
what do I need for tools?
Something like this
Quote:
is this done via the computer and having an appropriate cable?
No.

But to be honest, adjusting CO potentiometer is the LAST thing on the checklist that should be done.
It's more likely that fresh fuel, new/cleaned air filter, new spark plugs, clean and adjust throttle bodies, sync vacuum will lead to solution. I asume that TPS sensor still has paint over adjusting screws and that injectors are not cloged.

Last edited by Miko; 03-23-2018 at 09:19 AM.
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