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One sooty plug with backfiring and poor low speed running

D

ducatiguzzi

Just got it firing!
Joined
Oct 2, 2015
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Location
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Hi All
My 2011 Stelvio NTX 8V has developed a sooty LHS spark plug. i've swapped the plug and the problem stays with the LHS. Diag is kicking out P0130 and P0141 fault codes, both lambda related but I'm thinking this could be a result of the rich running and not the fault itself. Everything looks fine physically, valve clearances, TPS, no HT leakage as far as I can see (I have plugs and caps on order though). Its only done 17k miles and the air intakes are very clean. When running, it is often rough on small throttle openings but clears when I gun it, worse when hot. Why would only one side decide to run rich? Thanks
 
Last edited by a moderator:
Pay attention to the notice for posting about software.
I would just disconnect the O2 sensors & see if rich condition goes away, rule out the faults the ECU is telling you. If it is faulty O2 sensors the plugs will clean up. It will throw a code but will take them out of the issue.
 
Switched lambdas off and now running nicely. 1st pic os standard map, 2nd with lambdas disabled. Thanks guys
 

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vagrant said:
Might just as well replace the plug boots now people use screwdrivers to remove and destroy them slip a big zip tie under instead. New plugs are cheap
Click to expand...
True, but I do not recommend the zip-tie method either. It will cause the same issue. Best is to leverage the valve cover off with the boot in place using a finger or palm to hold the boot from flexing. Both valve cover and plug boot pop off easily and cause no damage.
john zibell said:
Time to replace the lambda on the rich side.
Click to expand...
Don't bother John, the freeware is at work again with ignorance.
 
ducatiguzzi said:
Hi, yes . Im deliberating £80 for a new lambda or a new map or leave disabled with current map.
Thanks
Click to expand...

I believe the lambda is the same as for a certain model Fiat. I think the Brava but I could be wrong. The key feature is the 4 pin connector. You might find one for less than from a dealer.
 
I do know that Todd has a nice tune for the model Stelvio. Vagrant here had it installed then sold bike later and I rollerized it for the next owner. Bike ran very well. Had a pipe on it which helped. Good luck in your search.
 
ducatiguzzi said:
...Why would only one side decide to run rich? Thanks

Im deliberating £80 for a new lambda or a new map or leave disabled with current map.
Click to expand...

Couldn't be that you like so many others, have used that terrible "Free" and unsupported garbage software to go mucking around in your ECU could it? More Moto Guzzi motorcycles have been wrecked by that piece of crap than I can shake a stick at.

It's equivalent to performing brain surgery on yourself just because you can pick up a scapel on eBay.

Why in the world would you deliberately run your expensive motorcycle on a "current map" which I'm sure is from that garbage software as well, instead of purchasing a new λ sensor and running the motorcycle they way it was engineered?

I will never understand that kind of penny-wise-pound-foolishness.
 
scottmastrocinque said:
Couldn't be that you like so many others, have used that terrible "Free" and unsupported garbage software to go mucking around in your ECU could it? More Moto Guzzi motorcycles have been wrecked by that piece of crap than I can shake a stick at.

It's equivalent to performing brain surgery on yourself just because you can pick up a scapel on eBay.

Why in the world would you deliberately run your expensive motorcycle on a "current map" which I'm sure is from that garbage software as well, instead of purchasing a new λ sensor and running the motorcycle they way it was engineered?

I will never understand that kind of penny-wise-pound-foolishness.
Click to expand...
Hi Scott
Thanks for your input.
para 1 - No, original fault described, no "mucking around"
para 2 - Im not trained in brain surgery but i am in other things... especially ebay
para 3 - Current map is from Moto Guzzi - version checked after my rollerisation by main dealer. I switched off the lambdas to prove the fault - I'm an electronics engineer, goes with the territory.
para 4 - Not sue what you mean here, £80 is pound foolish if I dont need to spend it. PS I think Ive found one for £25

Im sure you hear of plenty guys using non Moto Guzzi approved stuff you obviously dont condone but I suppose its up to the owner at the end of the day. I believe Guzzi shafted me with the flat tappet issue. I'll decide what to do with my bike from now on.

Thank you for your words of wisdom though. I do like your quote at the bottom of your post.... be happy!!
 
Hey, you are welcome!

You said “Diag“ and “problem” in the same post.

I thought you were communicating the exact same two words that if we allowed them on the forum, you would find those two together 98% of the time.

If that wasn’t your message and I missed it, then I’m sorry to have pricked you.

However, one cannot help but wonder precisely how you “turned off the lambdas”.

I guess you must have a Piaggio dealers Navigator software terminal?

Hmm.

Please, enlighten us all on how you did that because that is a really neat trick!

Oh, and changing between maps 1 and 2. I’m simply dying to hear how you magically accomplished that.

I’m all ears! (So is everybody else)

Please, tell us how you accomplished these amazing feats of ECU manipulation without a software communications interface to the ECU.

Any owner can do whatever they wish but we mechanics are not stupid.

I feel as if you have blown so much smoke up my bum that my eventual autopsy will be permanently ruined.

I could be wrong. Please, enlighten us.

Oh, and Moto Guzzi STEPPED UP TO THE PLATE regarding the flat tappet issue, and paid huge monies out to fix a problem, YEARS after their warranty responsibility had ended. They behaved EXEMPLARY in the regard.

I know this because I wrote the definitive post on the subject here.

Thanks for your story...

My quote is for people just like you.

Thanks. i’m always happy. I’m a motorcycle mechanic and I work for myself.

Cheers!
 
V700Steve said:
Pay attention to the notice for posting about software.
I would just disconnect the O2 sensors & see if rich condition goes away, rule out the faults the ECU is telling you. If it is faulty O2 sensors the plugs will clean up. It will throw a code but will take them out of the issue.
Click to expand...
Hi Steve. I'm sorry about mentioning software, I honestly didnt know it was banned. I'll not do it again. I'm going to order new O2 sensors since I'm now convinced this is the issue. Thanks. Jim
 
V700Steve said:
I do know that Todd has a nice tune for the model Stelvio. Vagrant here had it installed then sold bike later and I rollerized it for the next owner. Bike ran very well. Had a pipe on it which helped. Good luck in your search.
Click to expand...
Hi Again
Can you let me know how to contact Todd and find out how I can try his tune? I'm looking at the GRP pipe which is easily available in the UK. Mistral and Mivv seem scarcer.
Thanks again.
 
I have had Todd’s full setup for years on my Stelvio, including the PC-V, Autotune dual sensor setup, and airbox lid modification. I also have his reflash tool.

I use a Mistral carbon cone exhaust.

Since Installation, I have had what I refer to as “the best running Stelvio in the world”. Every friend who has ridden my motorcycle, agrees. I never once regretted spending the money to do that on my Stelvio.

Good luck with your quest.
 
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