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Discussion Starter #1
I am having a problem that I can't seem to solve. I have had the dealer check everything twice. The last time they calibrated the throttle position system and that helped the stumble that was happening at take off from a light. I removed the AI system and have a booster plug. The problem doesn't happen until about 50 miles or 1 hour of riding. When I stop for a light the engine will stall upon trying to launch. I have to keep revving it so it doesn't die. I have tried it with and without the booster plug. Doesn't seem to make a difference. I have adjusted the idle to 1200 but that doesn't solve the problem. Once the bike is cooled off it runs fine until about the same amount of time before it starts acting up. There is around 14000 miles on the bike. I had the valve check done at 12000 and they were in spec. The throttle body are balanced. I have tried higher octane gas and that doesn't make any difference. Any suggestions will be appreciated.
Thanks,
Don
 

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My 2012 America acted like that, except that once it died it would not start again until cooled down.
It turned out to be blockage in the vacuum lines out from the faux carbs.
I replaced them after Forchetto suggested and my bike has never exhibited that behavior again.
You may well have something else going on, but check those lines just in case.
 

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I am having a problem that I can't seem to solve. I have had the dealer check everything twice. The last time they calibrated the throttle position system and that helped the stumble that was happening at take off from a light. I removed the AI system and have a booster plug. The problem doesn't happen until about 50 miles or 1 hour of riding. When I stop for a light the engine will stall upon trying to launch. I have to keep revving it so it doesn't die. I have tried it with and without the booster plug. Doesn't seem to make a difference. I have adjusted the idle to 1200 but that doesn't solve the problem. Once the bike is cooled off it runs fine until about the same amount of time before it starts acting up. There is around 14000 miles on the bike. I had the valve check done at 12000 and they were in spec. The throttle body are balanced. I have tried higher octane gas and that doesn't make any difference. Any suggestions will be appreciated.
Thanks,
Don
Air temp sensor maybe?
 

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It won’t idle when it’s hot? If so, maybe it’s a bad crank sensor? My wife had a Softtail a number of years back and the sensor went bad. When it got hot it wouldn’t idle.
 

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Discussion Starter #5
Thanks for your help. I am going to relocate the Booster plug censor when the weather clears to see if that will help. If the problem keeps occurring I will have the Crank sensor checked. I had one go bad on an 09 America and that stopped it from running at all. Right now we are waiting for the hurricane to get over.
Don
 

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Thanks for your help. I am going to relocate the Booster plug censor when the weather clears to see if that will help. If the problem keeps occurring I will have the Crank sensor checked. I had one go bad on an 09 America and that stopped it from running at all. Right now we are waiting for the hurricane to get over.
Don
Yikes. Keep your head down. Good luck!
 

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Discussion Starter #7
I am still having a problem with my 2012 Speedmaster wanting to choke down at idle after it is hot. Runs great for 40 or 50 miles then acts up. When I removed the air injection system I left the sensors in the pipes unmolested. Will leaving them in place cause this kind of a problem? I had the impression from reading on this forum that it was ok to ignore them. My dealer wont touch them so if I need to shut those off I will need to go to a local shop. I also have the California emissions canister and all that stuff on the bike. I asked the to remove that the last time I had it in but they would not do that either. Florida does not have the strict California rules. I would remove it but I understand there are some fittings on the fuel injection system that need to be capped. I have tried to follow the vacuum hoses but they disappear into the mass of wires and hoses. Thanks for your input.
 

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You're getting confused. The SAI system attaches to the chrome pipes next to the spark plugs and it's the O2 sensors that are in the exhaust header pipes.

Triumph dealers tend to stick to a strict set of rules laid out by Triumph and many of them have a problem removing the SAI and O2 systems, as removal will cause an error and illuminate the engine error light. The only choice they then have is to fit after market parts to resolve the issue, which they won't do.

The Booster Plug is a "plaster" used to trick the ECM in to thinking the ambient air temperature is cooler than it actually is which enables the ECM to add more fuel to make a lean condition richer. It's not an ideal solution, but works in some situations.
 

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Discussion Starter #9
I have removed the air injection system. My question is do the sensors left in the exhaust pipes still effect the fueling at idle? And can that cause the problem of the engine losing the ability to idle after a period of time running? Removing the air injection cured some of my problems but not what I am dealing with now. There was a bad line attached to the pipe coming from the head. I found that when I removed the system. That improved the lack of power and smoothed out the engine. It runs good except when I stop for a light, it tries to die. And of course that is only in very heavy traffic. I keep revving it up to keep it from dying, but if it does die so far it has started right up. My dealer won't remove the sensors or the California emissions canister and can't seem to locate the problem. It is an expensive PIA to keep taking the bike to the dealer and not fixing the problem. I have had it there 3 times and still have the problem. I appreciate your input and look forward to your discussion.
Don
 

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If your 2012 Speedmaster is standard with no mods, then yes the O2 sensors totally control fueling at idle and if everything is how it should be you should not lose the ability to idle after a period of riding.

You said "There was a bad line attached to the pipe coming from the head", do you know what this line was for?

A common problem is the MAP tube rubbers that come from the MAP sensors to the inlet manifolds, these can rot and leak air which causes all sorts of running problems in the low revs/low throttle position area.
 

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Discussion Starter #11
The broken line was the rubber line attached to the tube coming from the head for the air injection. It was at the top of the clamp and on the back side. Not visible until I removed the clamp. I installed the New Bonneville removal kit. I am going to seek some non dealer help to try to solve this. The dealer is not able to go beyond Triumph rules. The only mods that I am aware of is the Triumph TORS mufflers. The dealer suspected the throttle position sensor and made the adjustments that Triumph recommended. That made a minor improvement to the initial start from stopped. I thank you very much for your input.
Don
 
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