leafman60
Cruisin' Guzzisti
My Stelvio has turned 10,000 miles and generally runs great. I have, however, noticed some seemingly intermittent issues with starting, idling and off-idle transition. I decided to disconnect the evaporative canister to see if that would help. It did.
The evaporative canister system is designed to capture gas fumes from the tank and hold them in the canister for the vacuum of the throttle bodies to suck out and circulate back into the intake system. A simple canister system will have a vent hose from the tank to deliver the fumes to the canister, a vent hose from the canister to vent any spare fumes or liquid fuel to the ground and a vacuum line from the throttle bodies to the canister to remove the fumes. Some canister systems have a electrical solenoid valve that opens and shuts the vacuum lines to better control the affect of the tap into the throttle bodies.
Apparently, the canister tap into the intake system on the Stelvio is upsetting the idle mixture and causing the issues I've noticed.
After disconnecting the canister my bike starts better, idles better and throttle response from idle is much better.
Scott has already provided a very good guide to disconnect and complete removal of the system-
https://www.guzzitech.com/forum/221/9202.html
I didn't want to take the time for all of that just yet. I wanted to simply disconnect the system and test it. I can come back later with the tank and dash removal.
All that is necessary is to remove the vacuum lines attached to the banjo fittings at both throttle bodies and to make sure the tank has a good vent. The entire opertion took maybe 15-20 minutes.
I simply used some long neoprene vacuum caps, ties and a piece of hose.
Remove the vacuum line from each intake and replace with a cap and nylon tie for good sealing. I didnt even remove the banjo and the long cap fit over the tubing insert (modulator valve?) that protrudes out from the banjo fitting. You could also connect a single hose from one intake tap to the other.
The removed vacuum line can then be stuffed out of sight up behind the manifold. May be a good idea to plug these leftover hoses to keep bugs out.
That's probably all that needs to be done but I wanted to be sure the tank had a good vent and that the canister did not inhibit that.
I easily removed the rear tank cover and replaced the stock vent line connection (the riders right side) with a short piece of hose.
I routed the hose down by the shock absorber. Job complete.
The evaporative canister system is designed to capture gas fumes from the tank and hold them in the canister for the vacuum of the throttle bodies to suck out and circulate back into the intake system. A simple canister system will have a vent hose from the tank to deliver the fumes to the canister, a vent hose from the canister to vent any spare fumes or liquid fuel to the ground and a vacuum line from the throttle bodies to the canister to remove the fumes. Some canister systems have a electrical solenoid valve that opens and shuts the vacuum lines to better control the affect of the tap into the throttle bodies.
Apparently, the canister tap into the intake system on the Stelvio is upsetting the idle mixture and causing the issues I've noticed.
After disconnecting the canister my bike starts better, idles better and throttle response from idle is much better.
Scott has already provided a very good guide to disconnect and complete removal of the system-
https://www.guzzitech.com/forum/221/9202.html
I didn't want to take the time for all of that just yet. I wanted to simply disconnect the system and test it. I can come back later with the tank and dash removal.
All that is necessary is to remove the vacuum lines attached to the banjo fittings at both throttle bodies and to make sure the tank has a good vent. The entire opertion took maybe 15-20 minutes.
I simply used some long neoprene vacuum caps, ties and a piece of hose.
Remove the vacuum line from each intake and replace with a cap and nylon tie for good sealing. I didnt even remove the banjo and the long cap fit over the tubing insert (modulator valve?) that protrudes out from the banjo fitting. You could also connect a single hose from one intake tap to the other.
The removed vacuum line can then be stuffed out of sight up behind the manifold. May be a good idea to plug these leftover hoses to keep bugs out.
That's probably all that needs to be done but I wanted to be sure the tank had a good vent and that the canister did not inhibit that.
I easily removed the rear tank cover and replaced the stock vent line connection (the riders right side) with a short piece of hose.
I routed the hose down by the shock absorber. Job complete.