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I did search, and already dbl checked the spark plug wire seating...

2010 GTS 300 Super
1,100 on the odo.

I know it's definitely electrical related, and not fuel / mechanical related issue. The engine cuts out just a split second while riding, and the "check engine light" and the "red code led light" comes on, and turns off after about two seconds. And this usually happens when I go over a bump or gets jarred, but not always - sometimes it just cuts out without any other warning...

Is there anything else I should look into / replace for this symptom, please? It seems like others have similar "GTS engine cutting out issues", but didn't see others with the same "lights" issue w/ engine cutting out.

Thank you!
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Hi buddy,
Sounds like the llamda probe wire loose or chafting the body / exhaust,
Give it a good ol looking over
Cheers Andy.
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andythebuilder wrote:
Hi buddy,
Sounds like the llamda probe wire loose or chafting the body / exhaust,
Give it a good ol looking over
Cheers Andy.
The Lambda probe!

Awesome, thanks andythebuilder!!!

Ummm, whereabouts is the Lambda probe located, and how does it look like please?

Sorry...
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Ah, I found this!

Lambda Probe
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Senna1Rossi wrote:
andythebuilder wrote:
Hi buddy,
Sounds like the llamda probe wire loose or chafting the body / exhaust,
Give it a good ol looking over
Cheers Andy.
The Lambda probe!

Awesome, thanks andythebuilder!!!

Ummm, whereabouts is the Lambda probe located, and how does it look like please?

Sorry...
Hi buddy glad to help,
The probe is bolted into the exhaust downpipe, locate the probe and with the aid of a mirror check the wires back to the loom for signs of chafing burning eventually you will find a cable joint un couple and look for corrosion, poor fit. Etc.
Hope you sort it , its just a process of elimination.
The earth strap to the body on a gts can also cause no end of electrical gremlins if corroded or not earhing properly, there is plenty of posts of how too's on here and in wiki.
Cheers Andy
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How have you determined that it is not a fuel issue? Last August my 300 had intermittent cutout/hesitation issues with accompanying flicker of the engine light. I was 2,500 miles from home at the time so took it to a mechanic who diagnosed it as a fuel injector issue. I'm not sure if it was the electrical connection or an obstruction, but he addressed both and it fixed the problem.

Good luck.
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bumps and fuses
You might also want to look into possible interactions between bumps and fuses (electrical shorts) in a GTS. These threads might be helpful:

This mystery appears to be solved. Basta!

and

https://modernvespa.com/forum/post1433154?highlight=fuse#1433154

Salima
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Bilbo wrote:
How have you determined that it is not a fuel issue? Last August my 300 had intermittent cutout/hesitation issues with accompanying flicker of the engine light. I was 2,500 miles from home at the time so took it to a mechanic who diagnosed it as a fuel injector issue. I'm not sure if it was the electrical connection or an obstruction, but he addressed both and it fixed the problem.

Good luck.
Hi bilbao,
The fuel pump does not trigger the ecl as described by the op, the lambda probe does trigger the ecl, also it happens when going over a bump, again not related to fuel pump overheating.
What triggers the ecl, the regulator out of spec, or the lambda signal out of spec
Start with the lambda as others have posted about loose connections and wires melting/ chafting on exhaust/chassis. Its an easy start point to check first and then eliminate.
Simples.
Oh and i have not diagnosed anything i am mearly pointing out credible possibilities / reasons as to what and why.
If i saw the bike in the flesh i would have any problem diagnosed as quick if not quicker than any mechanic ,piaggio trained or not.
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Isn't the Lambda sensor what we call an oxygen sensor?
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Bilbo wrote:
How have you determined that it is not a fuel issue? Last August my 300 had intermittent cutout/hesitation issues with accompanying flicker of the engine light. I was 2,500 miles from home at the time so took it to a mechanic who diagnosed it as a fuel injector issue. I'm not sure if it was the electrical connection or an obstruction, but he addressed both and it fixed the problem.

Good luck.
Thanks Bilbo!

Will check these oot as well!
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Re: bumps and fuses
Salima Draghetta wrote:
You might also want to look into possible interactions between bumps and fuses (electrical shorts) in a GTS. These threads might be helpful:

This mystery appears to be solved. Basta!

and

https://modernvespa.com/forum/post1433154?highlight=fuse#1433154

Salima
Thank you, Salima!

Another places to check if the Lambda unit isn't the culprit. Thanks
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Brilliant, thanks, Andy!

Cheers!


p.s.

Are you anywhere near Leicester City...? Heh
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mrt6644 wrote:
Isn't the Lambda sensor what we call an oxygen sensor?
I picture it as a fraternity... You know... Lambda Lambda Lambda



heh
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Senna1Rossi wrote:
Brilliant, thanks, Andy!

Cheers!


p.s.

Are you anywhere near Leicester City...? Heh
Yes mate i live round the corner, but i support man united Crying or Very sad emoticon
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andythebuilder wrote:
Senna1Rossi wrote:
Brilliant, thanks, Andy!

Cheers!


p.s.

Are you anywhere near Leicester City...? Heh
Yes mate i live round the corner, but i support man united Crying or Very sad emoticon
Darn! and too bad you didn't put couple of quids on the team at the opening of the season...
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andythebuilder wrote:
Hi buddy,
Sounds like the llamda probe wire loose or chafting the body / exhaust,
Give it a good ol looking over
Cheers Andy.
Engine should run without the llamba probe connected, it would just go into bypass mode and turn the engine light on.
First place I would look would be the kill switch. Flip it on and off a few times.
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WEB-Tech wrote:
andythebuilder wrote:
Hi buddy,
Sounds like the llamda probe wire loose or chafting the body / exhaust,
Give it a good ol looking over
Cheers Andy.
Engine should run without the llamba probe connected, it would just go into bypass mode and turn the engine light on.
First place I would look would be the kill switch. Flip it on and off a few times.
Ah! Will check the switch as well. Is this why people mention not to use the switch to turn off the engine, but rather use the ignition key?

Just curious if aftermarket complete exhaust systems doesn't require Lambda sensor?
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Senna1Rossi wrote:
Just curious if aftermarket complete exhaust systems doesn't require Lambda sensor?
Some do some don't. You're better off with the sensor though.
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I just want follow up on this post, and to mention that I foond the culprit! I feel like a such a dweeb... heh.

So, following the kindly advice from andythebuilder, and others, I made sure that everything electrical-wise seemed fine for the Lambda (O2) sensor. Making sure the wires and the connectors were ok. I even removed it from it's metal perch, and un-did the zip-tie, to make sure there weren't any kinks in the elec wires. Checked the kill switch, and many other connections. Went on many test rides after checking oot each of the items that I thought may be the culprit. Nothing seemed to be an easy, typical fix, so I kinda decided to take it to a local mechanic...

Last night, middle of being somber aboot the whole issue, I had an "Oh me gosh" moment! CHECK THE BATTERY!!!!!!!

I rushed over with a screwdriver to undue the battery panel. And guess what??? the negative terminal wire bolt was LOSE ON THE BATTERY!!! This would totally explain why it would cause such an issue. I tightened the bolt, and immediately went for a test ride! And it worked - no more "check engine" light, and "code" light!!!

Moral of the story? Make sure you check EVERYTHING! Even the most basic of the itmes. And thank some nice people here on MV forum.

THANK YOU!
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Congrats!
Sometimes it's the easiest thing.
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Well done, and thanks for posting back the fault, it really helps others with simlar problems
Andy
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mrt6644 wrote:
Congrats!
Sometimes it's the easiest thing.
Thank you, mrt6644!

so funny... you know it! haha
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andythebuilder wrote:
Well done, and thanks for posting back the fault, it really helps others with simlar problems
Andy
Thank you, Andy!!

Yes, I definitely wanted to post some info just in case that others may have same issue. There was that split second engine hesitation, followed by the engine light and the code light. The battery connection wire was obviously intermittently connecting, and disconnecting, and that would reset the lights.

Hopefully someone will find this when they do a search in the future for possible issues.

Cheers!
⬆️    About 1 year elapsed    ⬇️
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GTS 300 Cutting Out
Greetings

There have been a number of posts in respect of GTS 300's cutting out at traffic lights and suchlike. I have experienced a similar problem with my own machine which is a GTS 300 registered January 2016 (UK). The problem started when the machine was approximately 9 months old and with 700 miles on the clock. After some trial and error on the part of my local Vespa dealer, the problem appears to have been resolved by installing the following Mapping update: 4530CW23. For the uninitiated (which included me prior to the problem occurring). Modern Vespa's have an electronic brain which regulates their performance. A Vespa dealer connects the 'PADS' system which is capable of diagnosing and rectifying faults; and enables factory updates to be installed. The above Map update was provided (by Vespa HQ) specifically to fix the problem with my machine.

Hope this helps others with a similar problem.
⬆️    About 5 years elapsed    ⬇️
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UTC quote
"I rushed over with a screwdriver to undue the battery panel. And guess what??? the negative terminal wire bolt was LOOSE ON THE BATTERY!!! "

My bike was misfiring and then cutting out completely with both engine light and code light flashing on.

Found this and checked the battery and both terminals were slightly loose, fitted shorter bolts and the problem has gone.

Just wanted to shout out a thankyou for this, its still helping 6 years on!
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