firing in three cylinders ? - MVAgusta.net
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post #1 of 12 (permalink) Old 08-02-2013, 04:41 AM Thread Starter
DMC
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firing in three cylinders ?

Hi everybody,



My F41000 has suddenly started firing in three cylinders I think.

I was riding along and all of a sudden, engine starting vibrating, funny noise and slight loss of power.

I stopped and with the engine running it looks like there was exhaust coming of all four pipes, so maybe there is another problem.

However it sounded very much like not firing on all four. Managed to get home.

Any ideas what it could be ?



Cheers
Dan
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post #2 of 12 (permalink) Old 08-02-2013, 04:51 AM
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Since the four exhaust are actually coming from a single collector you can't use that as a diagnostic tool.
You can however use the heat variance on each of the four header pipes to determine if you have dropped a cylinder.
Most likely you have a fouled plug, or a loose connection to one of coils or injectors.
First step is remove tank and air box, inspect connectors and pull plugs.
Let us know what you find....

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post #3 of 12 (permalink) Old 08-02-2013, 04:59 AM
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EBS relay, is it a 1000S ?

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post #4 of 12 (permalink) Old 08-02-2013, 06:00 AM Thread Starter
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Guys, Thank you for the quick reply, i'll try and see if one of the header pipes stays cool after I start the engine. I am in a very hot London at the moment.
Dan
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post #5 of 12 (permalink) Old 08-02-2013, 06:26 AM
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Quote:
Originally Posted by DMC View Post
Guys, Thank you for the quick reply, i'll try and see if one of the header pipes stays cool after I start the engine. I am in a very hot London at the moment.
Dan
You can do that the best by spraying a bit of water on each header pipe at the time. Like that you can very easy define which cilinder is not firing.

Most likely a spark plug. Had that a few times with my MV's.
This did not happen anymore after I switched to the iridium ones.

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post #6 of 12 (permalink) Old 08-02-2013, 06:31 AM
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I'll bet Donsy is spot on with the EBS relay......known to malfunction in the heat, too. Didn't DJester finally relocate his into a cooler air stream to stop this very problem with his Diamantť F4 1000S?

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post #7 of 12 (permalink) Old 08-03-2013, 02:25 AM Thread Starter
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After embarrassing myself with the exhaust pipes question I thought about going into hiding .
I keep the bike in my living room so its not like I donít see the exhaust pipes coming out of the catalytic converter every day.
In my defence, I was thinking of my old Ducati 748.

Any way when you mentioned the EBS relay and its position I became suspicious because I was messing around that area
When I replaced the radiator a couple of weeks ago, and maybe I pushed it even closer to the engine.
So I mowed it in the space behind the radiator and went for a ride.
It started fine and run fine for quite a while, however after about 15 min it started again, so I think its temperature related.
Does that point to the EBS ? Could a Spark plug cause problems after 15min ?
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post #8 of 12 (permalink) Old 08-03-2013, 08:22 PM
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It sure sounds like an EBS relay problem. Welcome to the forum.
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post #9 of 12 (permalink) Old 04-24-2015, 02:42 PM Thread Starter
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Thank you all for your help, it was the EBS relay !
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post #10 of 12 (permalink) Old 04-24-2015, 03:56 PM
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It took you almost two years to fix it??

What a beast of a motorcycle!
It growls and rages and flies across the tarmac like a wild animal that has escaped the confinement of a cage and after merely waiting restlessly until the release, will not endure being locked up ever again.


Skye I miss you. L'essentiel est invisible pour les yeux.
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