Stumped - 2011 Multistrada high idle, backfiring, misfiring - Page 2 - Ducati.ms - The Ultimate Ducati Forum
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post #11 of 26 (permalink) Old Apr 22nd, 2019, 4:05 pm Thread Starter
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Originally Posted by motoFiend View Post
Not sure if this will help but i had similar symptoms with my sport classic, but it was after changing out the exhaust. I upgraded the map on the ecu but had to take it back in to have them reset the TPS. Took him 3 minutes to reset it but afterwards it ran as smooth as it ever had.
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Damn Ducati. I have a love/hate relationship with them. Do a search on Tuneboy EMS. It's a PITA software, but it does work, and it may help you to determine what the heck is going on.

And you are right - the 2010 to 2012 motors - when running - are something special. A wicked, visceral experience.
Good info, guys. I'll look into this stuff. It's been raining a lot here in Maine, so it's hard to get anything done without a garage. I'll be sure to update the thread as I work through this.

And, yes. A wicked, visceral experience is entirely accurate. Just raw and wild.

2011 Ducati Multistrada 1200S Touring | 2015 Honda MX125 | 2016 Honda CB300F
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post #12 of 26 (permalink) Old Apr 24th, 2019, 1:12 pm
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Sounds like faulty MAP sensors or a vacuum leak in the MAP system.

My ENDURO did the same thing and it turn out that the MAP hoses had heat damage are were cracked.

Also check you ignition control plug for arcing.

GL
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post #13 of 26 (permalink) Old Apr 24th, 2019, 1:21 pm Thread Starter
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Originally Posted by mwhite5471 View Post
Sounds like faulty MAP sensors or a vacuum leak in the MAP system.

My ENDURO did the same thing and it turn out that the MAP hoses had heat damage are were cracked.

Also check you ignition control plug for arcing.

GL
More great info!

I've spent the last few hours reading through the shop manual and familiarizing myself with the operational concepts of the Multi. I'm hearing consistent feedback from this thread that the MAP sensor for the horizontal cylinder is likely the problem and the manual seems to agree.

I hadn't thought of the actual hoses being a problem, but I'll have to keep that in mind. As for the ignition control plug, is there one for each cylinder, or one plug for both?

2011 Ducati Multistrada 1200S Touring | 2015 Honda MX125 | 2016 Honda CB300F
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post #14 of 26 (permalink) Old Apr 28th, 2019, 1:00 am
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I had a very similar issue on my 2012 1200S. Everything was pointing to a bad MAP sensor. However, after finding no issues with the MAP sensors it turned out to be a bad fuel injector. Replaced the injector and problems all immediately disappeared.

It’s easy to check: Just swap the injectors over and see if the black spark plug goes with it. It also pays to check for leaks around the injectors and ensure they are properly mounted.
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post #15 of 26 (permalink) Old Apr 28th, 2019, 10:12 am
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Look to see if the throttle body is clean all around. I had a throttle bushing wear out causing an intake leak (with backfire) just off idle, especially when cold. The bad bushing caused the throttle body to get dirty in that spot.

(I have extra throttle bushings for you if that is your problem.)

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post #16 of 26 (permalink) Old Apr 28th, 2019, 10:20 am Thread Starter
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So, I'm here with a few more pages to add to my Multistrada saga. But I want to say first and foremost that I'm so grateful for those of you who have given input on this problem I'm having. It's given me many avenues to explore that I would be otherwise ignorant to. So, seriously, thanks everyone!

I've been reading over the shop manual about the operational principles of the engine control systems (I feel like a nerd just writing that). One of the major take-aways with the MAP sensors is that if one is throwing a fault (open-circuit or whatever) the ECU will use the information from the other sensor for BOTH cylinders. It will still throw a code, but the bike should, in theory, run normally. So, I tried to test that theory and either confirm or rule-out the hort. cylinder MAP sensor being the problem.

I unplugged the hort. cylinder MAP sensor and ran the bike.

You would think it won the lottery with how rich it was running. It was also backfiring and stalling out. The bike didn't want to rev up and when it did, it had a fit. But it never threw a code.

I'll say that again: never threw a code.

I ran that engine for at least a minute and didn't get any information from the ECU on the dash nor a CEL. Per the manual, it's supposed to throw a code when it senses an open-circuit going to either (or both) MAP sensors.

I plugged the sensor back in and the bike returned to how it has been running for the past few weeks? months? I don't remember when this even started anymore.

This leaves me with a few questions:
Why on earth did it not throw a code?
How often does the ECU check for an opened circuit (maybe I didn't let it struggle long enough)?
Why did it not switch over and use the other MAP sensor for the vert. cylinder like the manual says it should?
Does the fact that it ran worse mean it isn't the MAP sensor at all and I'm just chasing a wild goose?

If I don't get any clear answers on this, I'm just going to move on and check the hoses to the MAP sensors, like mwhite5471 suggested. If it isn't that, I'll move on to the injectors like wal916 and Steve W. suggested.

2011 Ducati Multistrada 1200S Touring | 2015 Honda MX125 | 2016 Honda CB300F
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post #17 of 26 (permalink) Old Apr 28th, 2019, 10:25 am Thread Starter
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Originally Posted by coast range rider View Post
Look to see if the throttle body is clean all around. I had a throttle bushing wear out causing an intake leak (with backfire) just off idle, especially when cold. The bad bushing caused the throttle body to get dirty in that spot.

(I have extra throttle bushings for you if that is your problem.)
This is great info! I'll have to check for this while I'm looking at the injectors.

2011 Ducati Multistrada 1200S Touring | 2015 Honda MX125 | 2016 Honda CB300F
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post #18 of 26 (permalink) Old Apr 28th, 2019, 11:23 am
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Originally Posted by tmendola View Post
This is great info! I'll have to check for this while I'm looking at the injectors.
It can be seen with a flashlight. No other tools needed to see this problem. (no disassembly)

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post #19 of 26 (permalink) Old Apr 28th, 2019, 12:03 pm Thread Starter
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Quote:
Originally Posted by tmendola View Post
This is great info! I'll have to check for this while I'm looking at the injectors.
It can be seen with a flashlight. No other tools needed to see this problem. (no disassembly)
Oh! Even better!

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post #20 of 26 (permalink) Old Apr 28th, 2019, 2:02 pm
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Originally Posted by tmendola View Post
I unplugged the hort. cylinder MAP sensor and ran the bike.

You would think it won the lottery with how rich it was running. It was also backfiring and stalling out. The bike didn't want to rev up and when it did, it had a fit.
Pretty much my experience when my sensor was intermittently acting up, although the stalling was something I only experienced when riding.

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Originally Posted by tmendola View Post
But it never threw a code.

I'll say that again: never threw a code.

I ran that engine for at least a minute and didn't get any information from the ECU on the dash nor a CEL. Per the manual, it's supposed to throw a code when it senses an open-circuit going to either (or both) MAP sensors.

I plugged the sensor back in and the bike returned to how it has been running for the past few weeks? months? I don't remember when this even started anymore.

This leaves me with a few questions:
Why on earth did it not throw a code?
How often does the ECU check for an opened circuit (maybe I didn't let it struggle long enough)?
Why did it not switch over and use the other MAP sensor for the vert. cylinder like the manual says it should?
Does the fact that it ran worse mean it isn't the MAP sensor at all and I'm just chasing a wild goose?

If I don't get any clear answers on this, I'm just going to move on and check the hoses to the MAP sensors, like mwhite5471 suggested. If it isn't that, I'll move on to the injectors like wal916 and Steve W. suggested.
I don't have the answer to the code problem, or your questions about ECU behavior. Mine obviously did throw the code at some point because I had the CEL and the code was logged in the history. But, at the dealer, there were no active codes even though it was a touch sketchy on the way there. I also had several runs with no error indication and no running problems, other runs with no CEL but some running problems, others with CEL and scary situations at traffic lights.

I didn't chase the goose, I just replaced the sensor on the advice of the dealer tech even though he said he couldn't guarantee that was the problem and it has be fine since. $115 to avoid the goose chase. Obviously, I too provide no guarantees, only anecdotes, YMMV

1976 RD400 (Project), 1997 916 Biposto, 2013 Street Triple R, 2014 Multistrada 1200S
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