I have a problem with my 2008 Stelvio 4V (never understood the different nomenclature of 4V/8V as they both have 4 valve heads). I have found the forum great for tech info and solutions over the years but I need some help on this one as I’m out of ideas.
Basically, the bike will start and idle ok, albeit a bit rough as if it’s only running on one pot, but it won’t take any throttle and just bogs down. If you snap the throttle open it will just stall. On the road it just feels like it’s running on one and will pull accordingly, occasionally firing on both and popping off unburnt fuel. So first assumption is plugs/ignition, however, the bike will actually start just as well on either cylinder with the other plug cap removed.
The fault first started showing a few months ago, and oddly only when the tank was almost empty. Fill the tank and all was ok. However after a long tour down to the alps it has progressed to be like this regardless of how much fuel. It has approx 24k miles on the clock.
Things I have tried;
New plugs/caps/HT leads
Checked fuel pump/filter
Checked air filter/airways clear
Checked valve clearances
Reset TPS and checked for sensible readings with throttle opening (with Centurion s/w from Todd)
Checked TB vacuum/balance
Swapped the exhaust can
No live faults on dashboard
So, I have a Guzzi dealer close and put the bike into the workshop today. The Guzzi mechanic has rechecked all of the above and also;
Run a full diagnostic
Checked cam timing
Checked flywheel timing pickup
Swapped a fuel tank c/w pump & filter from another Guzzi
Checked the stepper motor
Reflashed the ECU map to standard
Tested HT & injectors
No progress. He is out of ideas and we are both reluctant for him to keep fiddling away without a specific POA and charging me by the hour.
Has anyone experienced and similar problems or have any suggestions on what else we can try. Sadly the shop doesn’t have another Stelvio which they can swap bits off to eliminate potential faulty parts. I think he said the tank was off a Norge. All help would be welcome. I love the Stelvio, it’s a great bike when it runs well!!
Basically, the bike will start and idle ok, albeit a bit rough as if it’s only running on one pot, but it won’t take any throttle and just bogs down. If you snap the throttle open it will just stall. On the road it just feels like it’s running on one and will pull accordingly, occasionally firing on both and popping off unburnt fuel. So first assumption is plugs/ignition, however, the bike will actually start just as well on either cylinder with the other plug cap removed.
The fault first started showing a few months ago, and oddly only when the tank was almost empty. Fill the tank and all was ok. However after a long tour down to the alps it has progressed to be like this regardless of how much fuel. It has approx 24k miles on the clock.
Things I have tried;
New plugs/caps/HT leads
Checked fuel pump/filter
Checked air filter/airways clear
Checked valve clearances
Reset TPS and checked for sensible readings with throttle opening (with Centurion s/w from Todd)
Checked TB vacuum/balance
Swapped the exhaust can
No live faults on dashboard
So, I have a Guzzi dealer close and put the bike into the workshop today. The Guzzi mechanic has rechecked all of the above and also;
Run a full diagnostic
Checked cam timing
Checked flywheel timing pickup
Swapped a fuel tank c/w pump & filter from another Guzzi
Checked the stepper motor
Reflashed the ECU map to standard
Tested HT & injectors
No progress. He is out of ideas and we are both reluctant for him to keep fiddling away without a specific POA and charging me by the hour.
Has anyone experienced and similar problems or have any suggestions on what else we can try. Sadly the shop doesn’t have another Stelvio which they can swap bits off to eliminate potential faulty parts. I think he said the tank was off a Norge. All help would be welcome. I love the Stelvio, it’s a great bike when it runs well!!