I need some help/advise re possible air leak/ingress on the 2016 America. I had the throttle body tops off, engine idling, squirting carb cleaner around to see if any would get drawn into the engine to pinpoint any air leak. The only place that did seem to draw any of the carb cleaner in was when I squirted it into the top of the throttle body onto the injectors. Should this happen? Or should the injectors be sealed?
On a 2016 model I’d be surprised, but it could be the injector O rings that are leaking. You can get them separately from Triumph. Try Fowlers parts https://www.fowlersparts.co.uk/parts/7244/america-efi-models/throttle-bodies
At about 2500-4000 rpm, on a very light throttle, perhaps only 1-3% open, the engine hesitates/stutters. New plugs have removed most of it, but i was squirting carb cleaner around to see if air was being drawn into the engine. Under load its fine.
Most air leaks will be most apparent during closed throttle deceleration as vacuum in the intake is at its highest then.
Throttle bodies & TPS were both checked & were spot on. Until i replaced the spark plugs it was terrible, seemed one of the plugs was breaking down when hot, now 80% cured & the remaining stuttering is only apparent when I really try hard to make it happen. It was more the issue of the carb cleaner getting into the intake around the injectors/fuel pipe.
Well it could well be a seal then, although I doubt you’d get a good balance if one of the injector seals was leaking. Have you tried running some STP fuel system cleaner through? Lots of people have experienced good results after using it.
