Gearbox cover. Now: idle issues

[Drahchir]

Hi there. Yes I was thinking about replacing the spark plug caps and the HT leads as they are over 20yrs old.

I’m going to check compression in the week, but she’s only got 11000 miles (I know Guzzis don’t like to be standing)so I don’t think that pistons or rings should be an issue! I’m thinking as has been mentioned that it’s fueling. So I’m lucky to live close to Lougi Moto. Rich is a Ducati legend, but knows his way around Guzzis.

So I’m thinking power commander,or remap. Both pretty much in the same price range. From what I understand the remap will deal with everything that ecu controls. Yet a P/C will only deal with the fuel delivery.

When I rode for about 20mins today and parked up to put in garage she purred like a kitten at 1000rpm!

I’m starting to get out of depth with it. I’m no expert. Still any suggestions would be appreciated 👍🏻

 

[Drahchir]

Apologies. Lougi moto is in the UK.

also not far from me is Max de Clifford  who is a Guzzi guru Not far away from me.

[gstallons]

3 hours ago, Drahchir said:

Hi there. Yes I was thinking about replacing the spark plug caps and the HT leads as they are over 20yrs old.

I’m going to check compression in the week, but she’s only got 11000 miles (I know Guzzis don’t like to be standing)so I don’t think that pistons or rings should be an issue! I’m thinking as has been mentioned that it’s fueling. So I’m lucky to live close to Lougi Moto. Rich is a Ducati legend, but knows his way around Guzzis.

So I’m thinking power commander,or remap. Both pretty much in the same price range. From what I understand the remap will deal with everything that ecu controls. Yet a P/C will only deal with the fuel delivery.

When I rode for about 20mins today and parked up to put in garage she purred like a kitten at 1000rpm!

I’m starting to get out of depth with it. I’m no expert. Still any suggestions would be appreciated 👍🏻

 

Get a good DVOM and check resistances . Do not replace just because....

[audiomick]

5 hours ago, Drahchir said:

...

So I’m thinking power commander,or remap. ...

Forget the power commander. There are maps around for the V11s, and they don't cost the earth. Putting them in is, by all accounts, very easy.

Ask here when you are ready to go at that.

 

Why not the power commander? Because it "fools" the ECU. Why that, when putting in a different map is easy, and there are alternative maps available for very little money.

 

[audiomick]

 

I just looked back at the first post in this thread, and noticed this:

On 4/22/2025 at 6:52 PM, Drahchir said:

So the spring(gu04238300) failed.

I'm rather surprised that no-one has pointed to this yet:

They are still available. @Scud has them.

[docc]

Seems that the OP, @Drahchir, has moved on to his idle issues, hence the change of the topic name.

In that regard: A new map? A Power Commander?  No. Really: A "Decent Tune-up."

[Drahchir]

Ok. I feel it’s a bit intimidating posting my questions ,as everyone has a wealth of knowledge and experience and I don’t! So please bear with me!

 Should of said that I bought new mistral exhausts and done away with the crossover.

I checked the compression on both sides and they are pretty much identical, about 150 psi.

I have one new spark plug that is white and the other is brown, which is what looks good.

So does this mean I have a fuel issue?

 I’m not going to use guzzidiag as that’s out of my league.

 I’m considering taking it to get an ecu diagnosis.

[docc]

At the very minimum, I would adjust the valves and balance the throttle bodies.

Also, check carefully for any intake or exhaust leaks. Even very minor ones can cause trouble.

[Drahchir]

I did the the valve clearance slightly looser than factory on what I’ve read here.

I did look into Guzzidiag. There was a post from Guzzitech. Who quoted not to use it. 

[Drahchir]

I did the the valve clearance slightly looser than factory on what I’ve read here.

I did look into Guzzidiag. There was a post from Guzzitech. Who quoted not to use it. 

[audiomick]

2 hours ago, Drahchir said:

Ok. I feel it’s a bit intimidating posting my questions ,as everyone has a wealth of knowledge and experience and I don’t!

Nobody was born with that knowledge and experience. Everyone learned it somewhere.

1 hour ago, Drahchir said:

I did look into Guzzidiag. There was a post from Guzzitech. Who quoted not to use it.

I'd rather like to know who wrote that, and what his background, training and experience is. As it happens, I've met and talked to the bloke who wrote GuzziDiag several times.  I have faith in his work. He is definitely not an idiot, and is a professional programmer.

All that GuzziDiag does is read out the information that the ECU is receiving, nothing more.

IAW reader reads out the map in the ECU. IAW writer writes a map into the ECU, which, if the new map is dickey, or the process is interrupted (flat battery or whatever) could cause problems.

Edited May 24 by audiomick

[docc]

We have a member here that was told by those folks that guzzidiag would ruin his ECU. The fellow was elated to learn how to interface  with his V11 using guzzidiag and has done it now, numerous times.  As have many of us, with no adverse effects.  It can be challenging to get it to connect, sometimes.

With your plugs suggesting an "imbalance", it seems prudent to address the throttle body balance next.

IMO, there is no advantage to perform parts of the entire tune-up, but let's work what you are comfortable with, @Drahchir

[audiomick]

4 hours ago, Drahchir said:

...There was a post from Guzzitech....

Since I had never heard of them, I went looking. Didn't spend too much time on it, but I came up with this.

I found this thread:

https://www.guzzitech.com/forums/threads/v7-v85tt-9-e4-e5-diag-tool-info.25192/

apparently discussing a diagnostic device that can be purchased from here:

https://gtmotocycles.com/

and what did I find down at the bottom of that page? A link back to the Guzzitech forum.

 

Forgive me for getting the feeling that they are shit-canning a good program, GuzziDiag, developed and made available for free by a handful of intelligent, competent and engaged individuals, to "protect" their own commercial interests. I don't know how I could come up with that idea.

Edited May 24 by audiomick

[audiomick]

And another thing. I realise I am harping on the subject a bit, but I think I'm a little annoyed.

Anyway...

GuzziDiag came into being through the German forum that I am active in. There is an entire board there dedicated to the topic. On that board, there are currently 590 threads, a total of 6997 posts.

Admittedly, I haven't read every single post, but I have at least skimmed quite a lot of that. It interests me.

There are a lot about "having trouble connecting", quite often due to not having read the instructions properly, a lot of "can it do xxx yet?", to which the answer is generally "we're working on it", and quite a lot of creative input on the further developement of the program.

What I cannot recall ever having seen is a post saying "I connected Guzzidiag, and it bricked my ECU". Or that connecting Guzzidiag caused any problems whatsoever that weren't there before.

And remember (WARNING: potentially predjudiced comment!!!) I'm talking about a German forum. The rule is: complain first, then get irate and bluster and rant a lot, and then listen to the explanation. Maybe. And then explain at great length, several times, why the explanation can't possibly be right, and that there is no possible way that one could concievably have stuffed things up oneself.

The point is, if Guzzidiag were prone to bricking ECUs, I'm pretty sure I would have noticed.

 

PS: and given that I am an Admin on that forum, I can assure interested readers that "negative press" regarding GuzziDiag definitely does not get "censored". There is too much interest there in having the program work properly for that sort of bullshit.

 

Edited May 24 by audiomick

[pete roper]

The reason Guzzitech’s boss rants about The Guzzidiag suite of tools is because using them cuts into his profiteering from selling unnecessary, obsolete shit that he doesn’t even understand and often doesn’t work.

Using Guzzidiag and the ‘Reader’ and ‘Writer’ programs CANNOT brick or otherwise damage your ECU. Using a correctly constructed aftermarket map allows you to achieve far more, far better, than using a shitty add-on like a Power Commander or the like.

Quite simply it is my belief that your problems could likely be fixed by simply tuning your bike correctly. Start at the beginning with valve lash then go through with throttlebody balance and TPS adjust and it’ll probably be golden. Don’t be tempted by stupid crap like aftermarket air filters and ‘Sensor foolers’. Just tune it correctly first. If it’s still giving issues they will be a lot easier to identify rather than just going for the ‘Scattergun’ approach to diagnosis.