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 Stepper motor acting up

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beetle
guzziownr
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guzziownr
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guzziownr

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PostSubject: Stepper motor acting up   Stepper motor acting up Icon_minitime1Sun Jul 11, 2021 5:26 am

According to my reading the band-aid fix is to spray it with carb cleaner and cycle it with Guzzi diag. Where exactly should I be spraying?

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beetle
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Sun Jul 11, 2021 5:45 am


It's not obvious, but the hose connected on the lower left side of the airbox closest to the the throttle bodies.



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guzziownr
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Sun Jul 11, 2021 6:02 am

Thanks Mark, is it in the diagram? Here is a grainy photo of what I think is my stepper. [You must be registered and logged in to see this image.]
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Pete Roper
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Sun Jul 11, 2021 9:47 am

Hose #4 in the top pic.
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guzziownr
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Sun Jul 11, 2021 10:05 am

Thanks Pete!
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guzziownr
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Sun Jul 11, 2021 3:13 pm

No joy on the spray. My comprehensive survey of one '07 GRiSO owner and one '07 Norge owner says to bypass the gizmo. Is there a stepper motor bypass for dummies page? It didn't pop up in my search.
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Oz1200Guzzi
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Sun Jul 11, 2021 3:43 pm

Plug the pipe! I use a short 8mm bolt
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Pete Roper
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Sun Jul 11, 2021 4:01 pm

If you plug the pipe make sure you plug the spigot on the airbox as well.

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Evilgarfield
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Mon Jul 12, 2021 12:38 am

If you plug the stepepr, do you have to open up the air bleed valve on the TB to compensate?
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Pete Roper
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Mon Jul 12, 2021 3:04 am

No
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guzziownr
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Mon Jul 12, 2021 11:17 am

Plugged hose and airbox spigot. Bike started from cold instantly (cold being relative as it is Summer in NY) instead of chugging and stopping, settled into a nice 1100 RPM idle. I take it cold weather starts are where it will get tricky.
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Oz1200Guzzi
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Mon Jul 12, 2021 3:43 pm

Yes, cold starts could be challenging but it really depends on where your bike idles in the first place. Mine, being a 2V dunger, idles around 1300, so on startup in cold weather puts this around 1100, though it soon rises.

I've had this issue in colder temperatures and a judicious use of the throttle will help until the system can sustain its own idle.

Mine (stepper)has been out of use for the last 6 years with no issues.
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BrianD
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Tue Jul 13, 2021 4:18 am

I can say that I have not had any problems with starting in winter after disconnecting the stepper -probably around 20,000 miles now; The problem with the stepper motors is the actual motor because cleaning the airways with whatever method you use does not fix the problem.

Not having to adjust air bleeds is one job less too!
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Pete Roper
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Tue Jul 13, 2021 4:46 am

BrianD wrote:
I can say that I have not had any problems with starting in winter after disconnecting the stepper -probably around 20,000 miles now; The problem with the stepper motors is the actual motor because cleaning the airways with whatever method you use does not fix the problem.

Not having to adjust air bleeds is one job less too!

No. It may not fix the problem.

As for not having to adjust the air bleeds? How do you work that one out?
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BrianD
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PostSubject: Re: Stepper motor acting up   Stepper motor acting up Icon_minitime1Wed Jul 14, 2021 4:33 am

Fair comment, It's only that each time I service the bike I check the throttle balance both at high revs and tickover and have not needed to adjust tickover. As I mentioned I have had the stepper disconnected for a long time now.

I'm not sure how relevant this is but I blanked off at the throttle bodies after a year or so after having the link pipes connected to the stepper [main pipe blocked off].

I do wonder sometimes about this as my old Norton had a link pipe on the inlet tracts between the carbs. Think this was for low down torque.
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