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Sudden death

Chadlebowski

Cruisin' Guzzisti
Joined
Jul 28, 2015
Messages
149
Location
West Sussex; UK
Hi,

My 2009 Stelvio with 15k miles on it has been well cared for... The other day, after a 15min stint at 70mph, I slowed for an off-ramp, and as I rolled-off and pulled the clutch the engine cut out.

On occasion, when stationary in town, it feels like the bike wants to cut-out at idle, and needs a bit of a throttle blip.

Is this major? Or just a simple fix?
 
I had the same problem on my Breva 1100 a few years ago, a fairly simple fix, there was a service bulletin about this very problem. It entailed cleaning the throttle bodies from oil contamination. Mist from the engine breather gets into the air box and then deposits itself on the throttle bodies. I think it blocks a small hole or disrupts the air flow. After fixing it I re routed the oil breather out of the air box, blocked the hole and ran it into a separate container. The air box is nice and dry now. No more stalling.
 
Is this possibly connected to the fact that these Engines tend to settle their Oil level at about half-way between the Max and Min Dipstick marks?
I.e. If you fill to the Max mark, they tend to settle down to the half-way point no matter what.
So maybe this 'excess' Oil is 'breathing' out into the Airbox?
 
Is this possibly connected to the fact that these Engines tend to settle their Oil level at about half-way between the Max and Min Dipstick marks?
I.e. If you fill to the Max mark, they tend to settle down to the half-way point no matter what.
So maybe this 'excess' Oil is 'breathing' out into the Airbox?

Probably so.

I just had my throttle bodies loose, and there was a lot of goo between the throttle plates and into the intake ports. It appeared that it was coming from the idle stepper motor and that circuit. Yet my air box only had a slight amount of oil mist in it.
 
Sounds about right.
Oil mist breathing into the Airbox will mostly be sucked straight through into the Intakes, not much will 'settle' in the Airbox itself.
 
Bulletin has you removing the TB completely off the bike which is not necessary. You can remove the airbox and get to the TB's butterflies that way and then use a carb cleaner of your choice.

I do it the lazy way and use SeaFoam spray every spring. Comes with a straw long enough to reach the butterflies without removing the air box. Creates a hell of a smoke show, but works nicely. Takes a little finessing to get the straw to where you need it but it does work. Removing the airbox is an easier way, but doable if you don't want to venture down that route.
 
Bulletin has you removing the TB completely off the bike which is not necessary. You can remove the airbox and get to the TB's butterflies that way and then use a carb cleaner of your choice.

I do it the lazy way and use SeaFoam spray every spring. Comes with a straw long enough to reach the butterflies without removing the air box. Creates a hell of a smoke show, but works nicely. Takes a little finessing to get the straw to where you need it but it does work. Removing the airbox is an easier way, but doable if you don't want to venture down that route.

Thanks for the info. Forgot to mention that my experience with working on bikes pretty much only covers my Stelvio from May last year... Learning rapidly but may need a bit more guidance.

So assuming I went down the "removing the airbox" route, this all seems straightforward enough. I should just admit my ignorance and say that I do not actually know what a throttle body is. I've had a look through the manual and the few bulletins. Will it be pretty self explanatory once I get the airbox out?
 
I attached the TSB that was referenced in the thread.

Once you get the airbox out, you will see the two throttle bodies. One for each cylinder. They are what what regulates the amount of air to each cylinder. Each time you turn the throttle the butterfly valves on the inside of the TBs open up and lets more air in. The amount that it is open is measured by the TPS (throttle position sensor). The more you open the throttle, the more air you let in. That tells the engine how much fuel to add based on how much the TB are open, based on how much you turned the throttle. When you are at idle, the valves are held open slightly to let a minimum amount of air in. That is where a dirty TB is mostly affected as a small change in flow from dirt can make the idle erratic. That is the simple explanation.

If you remove the air box, you will see both TB valves. They are pretty obvious. Will have a gold looking valve in a silver body. This is what you want to clean. You can usually just spray some carb cleaner in the area and wipe it out until they are clean. Open the throttle to move the valves for a better clean.

Do a Google search on it. All TB's are pretty much the same on a fuel injected bike.
 

Attachments

  • 10-005-2010 Throttle Bodies.pdf
    72.5 KB · Views: 94
That's canuck1969 - that explanation helps to fill the gaps in my patchy understanding!

I carry out this procedure without the engine running? And where will the carb-cleaner spray vent out?
 
You can do it with the engine running if you want. Just make sure you don't suck in a rag or something into the TBs. Most carb cleaners have instructions on them to do it that way. Will actually clean better if you do but not necessary.

You can just spray an wipe the inside of the TB with the engine off. Open the throttle to clean where the valve and the side of the TB meet. That is the critical part. Make sure you prevent any drops of cleaner onto painted surfaces as some may run out when you spray. Carb cleaner is pretty volatile so most will just evaporate. What does not evaporate will just get burned off.
 
You can if the straw is long enough. I do it with seafoam as it comes with a long straw. Sea foam is oil based so u need to be within 1/2 inch of the throttle valve. You could use carb cleaner but most carb cleaners tend to swell rubber and not sure what it would do to the boots. Also the cleaners work best with direct contact. Most may evaporate before it gets to the valve unless u are close.

Maybe someone else has done it without issue. As long as you can direct it to the valves you should be good.
 
I attached the TSB that was referenced in the thread.

Once you get the airbox out, you will see the two throttle bodies. One for each cylinder. They are what what regulates the amount of air to each cylinder. Each time you turn the throttle the butterfly valves on the inside of the TBs open up and lets more air in. The amount that it is open is measured by the TPS (throttle position sensor). The more you open the throttle, the more air you let in. That tells the engine how much fuel to add based on how much the TB are open, based on how much you turned the throttle. When you are at idle, the valves are held open slightly to let a minimum amount of air in. That is where a dirty TB is mostly affected as a small change in flow from dirt can make the idle erratic. That is the simple explanation.

If you remove the air box, you will see both TB valves. They are pretty obvious. Will have a gold looking valve in a silver body. This is what you want to clean. You can usually just spray some carb cleaner in the area and wipe it out until they are clean. Open the throttle to move the valves for a better clean.

Do a Google search on it. All TB's are pretty much the same on a fuel injected bike.

Downloaded the throttle body cleaning tech bulletin file onto my android cell phone but cannot open it. Is it possible to get the file in a PDF format?

Thx
Mark
 
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